Can you tell the number of coins ?

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Can you tell the number of coins ?

Can you tell the number of coins ?
Dinki breaks her piggy bank
and found 71 rupees in form of 20-paisa and 25-paisa coins.
There were a total of 324 coins in her piggy bank.

Can you tell me how many number of 20-paisa and 25-paisa coins she got ?

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Answer :
20 paisa coins : 200
25 paisa coins : 124

Explanation:
Let the number of 20paisa coins be Y,
then number of 25paisa coins = 324-Y
0.20 * Y + 0.25 * (324 - Y) = 71
> 20Y + 25 * (324 - Y) = 7100 (Multiply both sides by 100)
> -5Y + 8100 = 7100
> 5Y = 1000
> Y = 200
So no of 20paisa coins = 200
and no of 25paisa coins = (324 - Y) = 124

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