exam Maths Puzzle Numerical Ability

Please help with the following problem:

Solve the system by addition method:

Eq 1 states 3x + 3y = 33
Eq 2 states 5x - 2y = 27

Please show work.

Thank you

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exam Other Question

If I know that a + b + c = 100 and I also know that .5a + 3b + 10c = 100 how do I find the values of a, b and c?
Thanks 1. If the lenght of a rectangle is doubled, does the area double? Why or why not?

2. If the height and the base of a triangle are doubled, what happens to the area? Explain.