For a formula, the sum of two external terms is 37, the difference is 13, and the ratio of the two ratios is 12 / 5

The two numbers of external terms are: (37 + 13) △ 2 = 25 and (37-13) △ 2 = 12
The ratio was 2.4
That is: 25: (25 × 12 / 5) = (12 / 5): 12
25:60＝5:12
Checking calculation: 25 × 12 = 300; 60 × 5 = 300
The product of the internal term is equal to the product of the external term, so this formula holds

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