exam Maths Puzzle Numerical Ability

if angle A and angle B are complementry, and angle A=3x+4 and angle B=5x+6, find x.

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exam Other Question

find the amount borrowed if you paid $300 in simple interest for 2 yrs at 2.5 %. 2[5(w+3)-(w+1)]=3(1+w) please help me solve.

Thanks,
CJ