Q&A - P5 Math

[MathIzzzFun]

ariasnow:

ariasnow:

Another question:


Sam had 20 more cards than Tony. During a game, Tony lost 14 of his cards to Sam. In the end, Sam had 4 times the number of cards that Tony had. How many cards did Sam have at first?

help needed on this. thks.

Hi

At first,
Tony --> 1 unit
Sam --> 1 unit + 20

Tony lost 14 cards to Sam :
Tony --> 1 unit - 14
Sam --> 1 unit + 34

1 unit + 34 = 4 (1 unit - 14) = 4 units - 56
3 units = 90, 1 unit = 30
1 unit + 20 = 50
Sam had 50 cards at first.

cheers.

[lawyerteachertutors]

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[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