Step-by-step explanation:
Find the ratio.
x / y --) 8/20 = 2/5
Find y.
2/5 x ?/? = 42/y ; 42/2 = 21
2/5 x 21/21 = 42/105
42/105 = x/y ---) x = 42 and y = 105
Find the ratio.
x / y --) 12/8 = 3/2
Find y.
3/2 x ?/? = x/12 ; 12/2 = 6
3/2 x 6/6 = 18/12
18/12 = x/y --) x = 18 and y = 12
