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62 = 20 X 60 + 70 X y / (20 + y)
62 = 1200 + 70y / (20 + y)
62 (20 + y) = 1200 + 70y
1240 + 62y = 1200 + 70y
1240 - 1200 = 70y - 62y
40 = 8y
y = 40/8
y = 5