book Maths Puzzle Numerical Ability

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?

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What will it cost to carpet a room with indoor/outdoor carpet if the room is 10 feet wide and 12 feet long? The carpet cost 12.51 per square yard. Saying thanks in advance!

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