book Maths Puzzle Numerical Ability

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Suppose the number of students in a math class is x. The teacher insists that each student participate in group work each class. The number of possibl

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Hi I am having diffuclties setting up this problem:

If 46 painters used 70 nails in 90 days how many nails would 23 painters use in 60 days? at work, Jack must stuff 1000 envelopes w/ advertisements. He can stuff 12 envelopes in one minute, and he has 112 envelopes already finished. Solve 1000 = 12n + 112 to find how many minutes it will take jack to complete the task