Answer:
y=4
Step-by-step explanation:
42/30 = (y+24)/20
Cross multiplying,
30*(y+24) = 42*20
30y + 30*24 = 840
30y + 720 = 840
Subtract 720,
30y + 720 - 720 = 840 - 720
30y = 120
Divide by 30,
y = 120/30 = 4
