exam Maths Puzzle Numerical Ability

The Red Machine makes 120 candies per minute. The Blue Machine makes 3 candies per second. How many Red Machines would you need if you wanted to equal the productivity of 4 Blue Machines.

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exam Other Question
Problem: Find the number of permutations of the first 8 letters of the alphebet for each situation.

25. taking 5 letters at a time Find the smallest values for a and b so that 21b = 25a