Vincent has 5 more 50-cent coins than 10-cent coins. After he used 6 of his 50-cent coins, the value of 50-cent coins is $1.50 more than the value of 10-cent coins. How many coins did he have at first?
f of the 0.50
t of the ten cent
f = t + 5
(f - 6 )0.50 = 1.50 + 0.10 t
(t - 1) 0.50=1.50 + 0.10 t
0.40 t = 2.00
t = 5
f = 10
15