Hi. Need help for this question.


George has 9 cards more than 3 times that of Henry’s. Izra has 20 more cards than 2/3 that of George while George has 13 cards more than Izra.

(a) How many cards does Izra have
(b) How many cards do the 3 boys have altogether?

Need help on this question pls.


Safiq had 300 apples and oranges. He sold 1/2 of the apples and 2/3 of the oranges. Then, he had 136 apples and oranges left. What fraction of the fruits were apples at the beginning?

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MathWithModels:

A box of pens was divided equally among 32 children.8 of these children gave up 2/5 of their share. As a result, the remaining children each received 4 more pens. How many pens were there in the box?


There are 24 remaining children. Each got 4 more pens.
So they got 24 x 4 = 96 pens altogether.
These 96 pens came from 8 children, so each child gave up 96/8 = 12 pens.
This was 2/5 of their share, so each child had 5 x 12 / 2 = 30 pens at first.
All the children had 32 x 30 = 960 pens at first.
There were 960 pens in the box.

Answer: There were 960 pens in the box.

This is the type of model solution just nice for my son to understand. Great solution! Thanks a lot. Can you help me for my the other question as well. Thanks

EconsPhDTutor:

Special-one:

Anyone know how to solve?


Elton had $350 more than John. Every day, Elton spent $30 while John spent $10.When Elton had spent alll his money, John still had $50 left.

a) How many days did elton take to spend all his money?
b) How much money did Elton have at first?

[1] J = E - 350,
[2] E - 30x = 0 ⇔ E = 30x,
[3] J - 10x = 50.

Plug [1] into [3] to get

E - 350 - 10x = 50 ⇔ [4] E = 400 + 10x.

Comparing [2] and [4], we have 30x = 400 + 10x and so x = 20.

Elton took 20 days to spend all his money.

E = 30x = 600.

Elton had $600 at first.

Hope this helps and feel free to ask for any clarifications.

- Dr. Choo Yan Min

http://www.EconsPhDTutor.com

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Thanks for your answer. But i need much easier solving model for my primary 5 son. This method i think is too difficult for my son to understand

A box of pens was divided equally among 32 children.8 of these children gave up 2/5 of their share. As a result, the remaining children each received 4 more pens. How many pens were there in the box?


Anyone pls help?

Anyone know how to solve?


Elton had $350 more than John. Every day, Elton spent $30 while John spent $10.When Elton had spent alll his money, John still had $50 left.

a) How many days did elton take to spend all his money?
b) How much money did Elton have at first?