Answer:
x numbers of coins in box A = 55
y numbers of coins in box B = 115
Explanation:
the numbers of coins in box y = x + 60
the value in cent of $ in box A is 50*x
and the value in cent of $ in box B is 20*y
So 50*x = 20*y +450
y = 60 + x
Solving for x 50x = 20*(60+x) +450 50x = 1200 + 20x +450
30x = 1650 x = 55
y = 60 +55 =115