exam
Maths Puzzle
Numerical Ability
joe can paint all the rooms of a house in 20 hours it takes ross 60 hours to do the same thing. How long would it iake them if they worked together?
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exam Other Question
give ab=be;bc=bd
prove ac=de
Suppose you have six families consisting of a mother, a father, and a child.
How many ways can the families sit in a row of 18 chairs such that members of each family are sitting together?