exam Maths Puzzle Numerical Ability

This problem was on a pre-employment exam.

If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?

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kanchan receives a certain amount of money on her retirement from her employer she give half of this money & an additional sum of Rs.10000/- to her daughter. she also gives one thi Could someone please take the time to help me solve the question: Solve the following system of three linear equations: 2 x + y + z = 3, - x + 2 y + 2 z = 1 and x - y - 3 z = -6. N