exam Maths Puzzle Numerical Ability

simplify the following fraction. If it is already simplified say so.

3a + b
________

6a + 2b

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exam Other Question

16000(1+r)squared=25000
I know that the value of r is .25 but I found that through trial and error. can you help me figure out the equation used to solve for r and get .25?? thank you Please help me solve:

3(-2-3x)=-9x-4