The sum of two external terms is 37, the difference is 13, and the ratio is 5 / 6

The sum of two external terms is 37, the difference is 13, and the ratio is 5 / 6

The sum is 37 and the difference is 13
So the two external terms are (37 + 13) / 2 = 25 and 37-25 = 12
The ratio is 6 / 5
So 12:10 = 30:25 or 25: (125 / 6) = (72 / 5): 12