Question

If a sum of rs. 80 is made up of 20p and 50p coins and there are a total of 340 coins, find the number of 20p coins

Answer 1

so x is the no.of 20 p coins
then the no.of 20 p coins =300



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Answer 2

Answer:

200

Step-by-step explanation:

Let x be the no. of 20 p coins

Since we are given that there are a total of 340 coins

So, no. of 50 p coins = 340-x

Value of x coins of 20 p = 20x

Value of (340-x) coins of 50 p = (340-x)50

We are given that the sum is rs. 80 i.e. 8000p

So, $20x+(340-x)50=8000$

$20x+17000-50x=8000$

$-30x+17000=8000$

$x=300$

Hence the number of 20p coins is 200.