exam Maths Puzzle Numerical Ability

Hi,

My brother is 13, and just want to query this question.

9y - 3y = 6y.

Is this correct? or does it subtract the y aswell meaning the answer would be:

9y - 3y = 6.

Thanks!!

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exam Other Question

Please help
Construct truth tables for the below Problems.

Determine how many cases are TRUE for each of the statements below.
p ∨ ~ q
A. None
B. 1
C. 2
D. 3 Write a description of the strategies you used in solving the problem of creating an equilateral triangle using only Euclid's five rules.