Answer:
a-
y=80
x=18
b-
y=24
x=6
(might have to recheck letter a)
7x+7b = 7(x+b)
..............
First change the mixed number into a fraction greater than one 1 1/2= 3/2, then divide 2 into 3 which results in 1.5
10 bronze medals
explaining:
if 3 of the medals were gold there would be 15 left. Since there was twice as many bronze from silver they would have 5 silver medals and 10 bronze.