book Maths Puzzle Numerical Ability

Here is a scaling problem. You land on a island where giants are 12 times as tall. The weight of the giant is ??? times that of you. The area of the cross section of the giants bo

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book Other Question

6. If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
a. 3 b. 9 c. 5 d. 4 e. none
The answer on the answer key is D, but I have no clue how to get the same. Please help! For the sequence below how would you solve this: write a recursive formula and fine the next three terms?

3,9,15,21