Question

a bag contains 1p, 2p and 5p coins 3/8 of the bag are 1p coins there are 640 coins in total work out the numbers of 2ps in the bag

Answer 1

Under 400 Coins

Explanation:

let 2p be X and 5p be Y

1p coin in bag=3/8=3/8×640=240

2p coin in bag=X

5p coin in bag=Y

240+X+Y=640

X+Y=400

X=400-Y

The number of 2p coins=400-number of 5p coins