Question
If A: B = 4: 5 and B: C = 3: 7, then what is the value of
(3A + 8C)/(6B - 2C)?Solution
A: B: C = 12: 15: 35
Let A = 12k, B = 15k, and C = 35k
So, (3A + 8C)/(6B - 2C) = (3 * 12k + 8 * 35k)/(6 * 15k - 2 * 35k) = 316/20 = 79/5
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24, 28, 37, 53, 78, ?
