#4 men and 6 boys can do a piece of work in 18 days. 12 men and 18 boys that work in how many days?
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It is inversly proportional. See since, you go from 4 men to 12 men, you go up by a factor fo 3. The same goes for the boys. So since you multiply the variables by a factor of three. Intuitively you should divide the number of days it will take by the same factor of 3. So 18/3 = 6. I hope that helps.