Let's see if they are or no.
6/10 = 15/ 25?
Let's suppose that the are proportional. Then,cross multiply:
6 x 25 = 10 x 15 ?
150 = 150 True.
Thus 6/10 = 15/25
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15 - 25 = -10
Use ratios, 20/15 = 25/x Multiply 15 by 20, then divide by 25. So 25 men could finish a job in 12 days.
-35
X/10 * 15/25 = 6 x=6
The answer is 27. 10+15=25. 25+2=27.