exam Maths Puzzle Numerical Ability

on the same page I don't understand the difference between problem 5 and 6 and how I get the answer for each.

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exam Other Question

A certain company makes a total of 96 ski vests each day in small, meduim, and large. If the number of vests made daily in the small and large sizes combined is equal to the numbe Can you help me solve.

4x^4 - 3xy^3 when x = -1 and y= -2

thanks