exam Maths Puzzle Numerical Ability

A man is 41 years old and his son is 9. In how many years will the father be three times as old as his son?

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exam Other Question

Solve each of the following systems by substitution.
4x-12y=5
-x+3y=-1 mohan can mow a piece of land in 4hrs. Kumar can mow it in 3hrs. Mohan can started mowing lawn all by himself and an hour later kumar joined with him together they finished mowing the lawn in total? Howlong did it take to move the lawn?