Q&A - P5 Math

[lawyerteachertutors]

If you are keen, my wife and I do provide private tuition and we specialise in all primary levels and will coach your child rigorously on exam techniques using top school exam papers. We have more than 15 years of teaching experience and are both Master degree holders from reputable universities. Which part of Singapore do you live?

[tianzhu]

Hi Xiao Hu


I took another look at the overlapping question.

The length of the rectangle is 16cm (same as before).

The area of the shaded area is 24 sq cm (same as before).

Total area of the unshaded area is 212 sq cm (different).

To avoid confusion, I’ve removed all my earlier posts on this question.

Best wishes

[SAHMwith2boys]

Hi all, encountered the below maths question and need help:


Machine A can produce 450 toys in 5 hours and Machine B can produce 120 less toys in 3 hours. Find the ratio of the number of toys produced by Machine A to the number of toys produced by Machine B every hour.

Would appreciate if explanation and working can be given as well so that I can have a better understanding...thanks a lot... :oops:

[elderflowertea]

Which part of Singapore do you stay at? I am a full time tutor giving tuition at my house area.

[tianzhu]

SAHMwith2boys:

Hi all, encountered the below maths question and need help:


Machine A can produce 450 toys in 5 hours and Machine B can produce 120 less toys in 3 hours. Find the ratio of the number of toys produced by Machine A to the number of toys produced by Machine B every hour.

Would appreciate if explanation and working can be given as well so that I can have a better understanding...thanks a lot... :oops:

Hi

Good Morning.

Machine A

5h ------ 450 toys
1h ------ 90 toys

Machine B

3h ------ 330 toys (450-120)
1h ----- 110 toys

Machine A : Machine B ------ 90:110 ------ 9:11

Best wishes

[Jamesbond]

1) Dan spent 2/3 of her money on some gaming accessories. She spent 3/7 of the remaining money on a box of colour pencils and the remaining $24 on a CD game.

a) What fraction of her money was spent on the CD?
b) How much money did Dan have at first?

2) Imu gave 2/7 of his salary to his wife and used 1/3 of his remaining money to pay his bills. Given that he had left $2200 for himself, find the salary of Imu?

Pl explain me in detail. vvv diff…Thanks in advance.

[SAHMwith2boys]

tianzhu:

SAHMwith2boys:

Hi all, encountered the below maths question and need help:


Machine A can produce 450 toys in 5 hours and Machine B can produce 120 less toys in 3 hours. Find the ratio of the number of toys produced by Machine A to the number of toys produced by Machine B every hour.

Would appreciate if explanation and working can be given as well so that I can have a better understanding...thanks a lot... :oops:

Hi

Good Morning.

Machine A

5h ------ 450 toys
1h ------ 90 toys

Machine B

3h ------ 330 toys (450-120)
1h ----- 110 toys

Machine A : Machine B ------ 90:110 ------ 9:11

Best wishes

Thanks TianZhu...

[Jamesbond]

1) Dan spent 2/3 of her money on some gaming accessories. She spent 3/7 of the remaining money on a box of colour pencils and the remaining $24 on a CD game.

a) What fraction of her money was spent on the CD?
b) How much money did Dan have at first?

2) Imu gave 2/7 of his salary to his wife and used 1/3 of his remaining money to pay his bills. Given that he had left $2200 for himself, find the salary of Imu?

Pl explain me in detail. vvv diff…Thanks in advance.

[CRAZYBANANA]

1) Dan spent 2/3 of her money on some gaming accessories. She spent 3/7 of the remaining money on a box of colour pencils and the remaining $24 on a CD game.

a) What fraction of her money was spent on the CD?
$24 = 4/7 of the remaining $
7 unit represents 1/3 of her $
At first, she would have 21 units
Therefore, the fraction is 4/21

b) How much money did Dan have at first?
1 unit = $24/4 = $6
21 unit x $6 = $ 126



2) Imu gave 2/7 of his salary to his wife and used 1/3 of his remaining money to pay his bills. Given that he had left $2200 for himself, find the salary of Imu?
He used 1/3 of 5/7 to pay bills.
He is left with 2/3 x 5/7 = 10/21
1 unit = $2200 / 10 = $220
His salary = 21 x $220 = $4620

[Jamesbond]

thanks a lot