exam Maths Puzzle Numerical Ability

-2 + 3 = 7p
p+1 3(p+1)
simplify

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exam Other Question

not in book.

4x-5<7x+10

x>-5

Is this correct?

and

2(5a-4)-3(6+2a)<6

I think a<8. Im i doing these correct? How many gallons of 12%solution must be mixed with a 37%solution to obtain 100 gallons of 22% solution?