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i have the following questions that stumped me in my last test. (48/100 marks) :-(
1.ratio of alan's age to peter's age is 5:4 now. in 6 yrs time, their total age is 120yrs. how old is alan now?
2. a sum of money was shared bet tom and jerry in the ratio 3:4. when tom gave 1/6 of his momey to jerry and jerry gave 1/3 of his new amount to tom, jom had $650 more than jerry. what was the sum of money shared by tom and jerry?
3.the participants at a conference are australia, singapore and taiwan. there are 240 more singaporean than australians. 34% of the participants are australians. the remaining are taiwanese.
a. how many australians are there at the conference?
b. % of singaporeans at the conference.
thanks!
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Originally posted by :
i have the following questions that stumped me in my last test. (48/100 marks) :-(
1.ratio of alan's age to peter's age is 5:4 now. in 6 yrs time, their total age is 120yrs. how old is alan now?
2. a sum of money was shared bet tom and jerry in the ratio 3:4. when tom gave 1/6 of his momey to jerry and jerry gave 1/3 of his new amount to tom, jom had $650 more than jerry. what was the sum of money shared by tom and jerry?
3.the participants at a conference are australia, singapore and taiwan. there are 240 more singaporean than australians. 34% of the participants are australians. the remaining are taiwanese.
a. how many australians are there at the conference?
b. % of singaporeans at the conference.
thanks!
Q1) 120 -12 = 1089 units = 108
Q2) 3 : 4 = 6: 8
after giving 1/6, ratio becomes 5:9
After giving 1/3, ratio becomes8:6
2 units = 650
14 units = 4550
q3) are there taiwanese?
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thanks for all the help. this is really useful in helping me understand the methods.
can i trouble all of you for a few more as a prep for my exams? these are questions given by my maths teacher for revision.
a. james is 1/4 as old as pete. in 5 yrs time, james will be 1/3 as old as pete. how old is james now?
b. 6 jugs of water can fill 5/8 of a pail. another 3 jugs and 6 cups of water are needed to fill the pail completely. how many cups of water can the pail hold?
c. anne and betty had $2600 altogether. after anne spent 3/4 of her money and betty spent 3/5 of hers, they each had the same amount of money left. how much money did each girl have at first?
thanks in advance!
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2008 PSLE Questions
Q48 Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?
Q47 Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day
Q46 A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.
(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?Anyone has questions for Q43, Q44, Q45 ?
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Originally posted by Lee012lee:
2008 PSLE Questions
Q48 Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?
Q47 Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day
Q46 A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.
(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?Anyone has questions for Q43, Q44, Q45 ?
Q48) Let 4 units to represent all the boys he invited and blah blah
4 units = 3 parts + 20
1 unit + 1 parts = 19Therefore, 4 units = 3(19-1 unit) + 20
4 units = 57 - 3 units + 20
7 units = 77
1 unit = 11
4 units = 443 parts = 44 - 20 = 24
He invited 44 + 24 = 68.
Q47)a)children:men:women = 40:45:15 = 8:9:3
b) 40 x 120/100 = 48% children
adults = remains at 60%
3/5 x 60% = 36% women
48 - 36 = 12%
12% = 336
1% = 28
Total percent in the end = 48 + 60 = 108%
108% = 3024
Correct me if i am wrong. lol quite hard.
Q 46) a) All together, one set = 4s
60 / 4 = 15 sets
15 x 2 = 30cmb) 56 / 2 = 28 sets
28 x 4 = 112 cm.
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Originally posted by Lee012lee:
2008 PSLE Questions
Q48 Bryan invited 20 more boys than girls to a party. 3/4 of the boys and 2/3 of the girls came. 19 people didn't come. How many people did he invite?
Q47 Visitors, 40% are children, 3/4 of the adults are women. (a) what is the ratio of children:men:women. (b) the second day, children number increased by 20%, adults number remain the same but women is 3/5 of adult. if there are 336 more children than women, how many visitors on second day
Q46 A millipede is climbing up a wall.
For every 3cm it climbs, it slips by 1cm.
It takes 3 seconds to climb 1 cm and 1 second to slip by 1cm.
(a) How far would the millipede have climbed after 1 minute?
(b) How long would the millipede take to climb 56cm?Anyone has questions for Q43, Q44, Q45 ?
Q48)
taking care of the extras ->1/4 x 20 = 5
G and B are now of equal units. therefore all those not there are -> 5+1/4g + 1/3g = 19
7/12g = 14
g= 24, b = 24+20 = 44
24+44 = 68
@Firepig: lol note your ratio, your men and women reversed liao, else i agree with your answer for 47
46a) for every 3 cm climbed (3 x 3sec) it slips 1 cm (1sec)
total time spent climbing a total of 2 cm is 10sec (includes climbing and slipping)
1minute -> 60 sec thus 6 sets of 2 cm climbed. distance traveled will be 6 x 2cm = 12cm.
b)To climb 56 cm, 56/12= 4minute 40sec
Edited by dibilo 10 Oct `08, 11:33PM
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