Question

The time (t days) required to build a house is inversely proportion to the numbers of builders,All looking is same rate.If there are six builders it takes 80days to complete the house.How many builders must be employed to build the house in just 16 days.

Answer 1

`\displaystyle 30`

Step-by-step explanation:

`\displaystyle [(80)/(16)][6] = [5][6] = 30`

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Answer 2

30

Explanation:

16 days is 16/80 = 1/5 the time for 6 builders, so the number of builders required is 1/(1/5) = 5 times that:

5 × 6 builders = 30 builders