Question

The value of 40 coins of 10p and 20p is rs 5.50.The number of 20p coins is

Answer 1

Answer:

THE ANSWER IS 16

Step-by-step explanation:

16*20P=3.2rs

remaining 24 *10=2.4rs

total 5.5rs

Answer 2

The number of 20 p coins is 15.

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Let's solve the given problem:

Let's say,

"x" → represents the no. of 10 p coins

"y" → represents the no. of 20 p coins

Total no. of coins = 40

So, we can form the first equation as,

$x + y = 40 \:.\: .\: .\: (1)$

The value of 40 coins of 10p and 20p is rs 5.50, so the second equation that can be formed from here will be,

$0.1x + 0.2y = 5.50 \:.\:.\:.\:(2)$

On multiplying equation (1) by 0.1, we get

$0.1x + 0.1y = 4\:.\:.\:.\:(3)$

On subtracting equation (3) from (2), we get

$0.1x + 0.2y = 5.50 \\0.1x + 0.1y = 4\\- \:\:\:\:-\:\:\:\:\:\:\:-\\---------\\\:\:\:0.1y = 1.5\\---------$

∴ $y = \frac{1.5}{0.1} = \bold{15}$

Thus, the number of 20 p coins is 15.

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