exam Maths Puzzle Numerical Ability

state the number to replace ? a + 3a= 1a = 3a = (1 + ?) a

Distributive property

Thank you

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exam Other Question

i got to find the width of a rectangle with the perimeter being 22 but, i have to use the given formulas Can someone help me with this problem?

I need to find the mean of the following set of numbers:

12, 16, 19, 22, 28, 30

Thank you,
Sher