The ratio of three numbers of a, B and C is 2:4:5. A is 12.6 less than B, so what is the average number of a and C

A = 12.6 ÷ (4-2) × 2 = 12.6
Average = 12.6 △ 2 × (2 + 5) △ 2 = 22.05

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