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## Question

primary 6 | Maths
| Ratio

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Red : 7 units

Difference = 3 units

There are 3 more units of red than blue buttons

For the newly bought buttons,

Blue = 29

Red = 8

Difference = 21 buttons

There were 21 more blue buttons than red buttons bought.

Since the number of red and blue buttons is the same in the end, the difference must be 0.

So, the difference at first must be equal to the difference of the buttons bought.

This is to get to the same number of blue and red buttons.

21 buttons = 3 units

1 unit = 7 buttons

Number of buttons at first

= 11 units

= 11 x 7 buttons

= 77 buttons

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