Q&A - PSLE Math

[Neat]

Hi!


Please help to solve the question:

The ratio of the number of males to the number of females at a performance is 5:7. 1/4 of the males and 3/4 of the females are children. What is the ratio of the number of adults to children? Express your answer in simplest form.

Thanks

[tech_nomax]

At Station A, the ratio of the number of children to the number of adults on a train was 4:5. At the next station, 12 children alighted and 10 adults boarded the train. The ratio of the number of children to the number of adults on the train then became 7:10. How many children were on the train at first?

[mum ks]

Neat:

Hi!


Please help to solve the question:

The ratio of the number of males to the number of females at a performance is 5:7. 1/4 of the males and 3/4 of the females are children. What is the ratio of the number of adults to children? Express your answer in simplest form.

Thanks

males: females=5:7 =>20:28
¼= 20 , ¾=60
Children = 60-28=32
Ratio of the no of adults to children = 48:32= 3:2

[Neat]

mum ks:

Neat:

Hi!


Please help to solve the question:

The ratio of the number of males to the number of females at a performance is 5:7. 1/4 of the males and 3/4 of the females are children. What is the ratio of the number of adults to children? Express your answer in simplest form.

Thanks

males: females=5:7 =>20:28
¼= 20 , ¾=60
Children = 60-28=32
Ratio of the no of adults to children = 48:32= 3:2

Thanks mum ks for your quick response.

However, the answer given is 11:13.

Regards

[MathIzzzFun]

Neat:

Hi!


Please help to solve the question:

The ratio of the number of males to the number of females at a performance is 5:7. 1/4 of the males and 3/4 of the females are children. What is the ratio of the number of adults to children? Express your answer in simplest form.

Thanks

Hi

ratio of males : females --> 5 : 7 --> 20 : 28
ratio of boys: men --> 5:15 (**1/4 of 20 : 3/4 of 20)
ratio of girls :women --> 21:7 (**3/4 of 28 : 1/4 of 28)
So,
ratio of adults : children --> 22: 26 = 11 : 13

cheers.

[MathIzzzFun]

kiasuaunt:

When Donald cycles from home to the park and back home, he will take half an hr. If he cycles to the park from home and runs back,he will take an hr. How long will he take to run both ways at the same speed? Thanks.

Hi

what (which part of the journey) remains the same ? --> cycle from home to park

what (which part of journey) changed ? --> cycle from park to home for 1st scenario, run from park to home for 2nd scenario

this means that the extra half an hour \"comes\" from the change ie running from park to home takes 1/2 h more than cycle from park to home.....can you complete the solution ?

cheers.

[MathIzzzFun]

tech_nomax:

At Station A, the ratio of the number of children to the number of adults on a train was 4:5. At the next station, 12 children alighted and 10 adults boarded the train. The ratio of the number of children to the number of adults on the train then became 7:10. How many children were on the train at first?

Hi

At first, Children : Adults --> 8u : 10u
In the end, Children : Adults --> 7u + 7 : 10u + 10
So, 8u - 12 = 7u +7
1u --> 19

Children, at first --> 8 x 19 = 152

cheers.

[Neat]

MathIzzzFun:

Neat:

Hi!


Please help to solve the question:

The ratio of the number of males to the number of females at a performance is 5:7. 1/4 of the males and 3/4 of the females are children. What is the ratio of the number of adults to children? Express your answer in simplest form.

Thanks

Hi

ratio of males : females --> 5 : 7 --> 20 : 28
ratio of boys: men --> 5:15 (**1/4 of 20 : 3/4 of 20)
ratio of girls :women --> 21:7 (**3/4 of 28 : 1/4 of 28)
So,
ratio of adults : children --> 22: 26 = 11 : 13

cheers.

Thanks MathIzzzFun

:thankyou:

[small]

Please help and many thanks in advance.


Question:
Vivian has some sweets. If she shares the sweets among 4 friends,5 friends or 9 friends, the remainder is 3,4 or 8 sweets respectively.What is the least possible number of sweets she can have?

[MathIzzzFun]

small:

Please help and many thanks in advance.


Question:
Vivian has some sweets. If she shares the sweets among 4 friends,5 friends or 9 friends, the remainder is 3,4 or 8 sweets respectively.What is the least possible number of sweets she can have?

Hi small,

share with 4,5,9 friends --> total 5,6,10 people
remainder --> 3,4,8
compare the number of people and remainder, you will see that if you were to add 2 to each remainder, the total number will be divisible by 5,6,10 respectively.

So, least possible number of sweets = lowest common multiple of 5,6 & 10 - 2

cheers.