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## Question

primary 5 | Maths
| Whole Numbers

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Hi, anyone can help with detail explanation on how to do this sum? Thanks

r: 2u

p: 32-2u

exchange

r: 2u => p: 3u

32 - 2u + 3u = 41

1u = 9

at first, 14 pencils

.

.

.

3 - 2 = 1

This means that the total number of items he has increases by 1 for every 2 rulers he trade.

Overall increase in number of items

= 41 - 32

= 9

So his overall number of items increased by 9. That's 9 times of 1, which means there were 9 times of 2 rulers traded.

So number of rulers traded

= 2 x 9

= 18

Number of pencils at first

= 32 - 18

= 14

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