exam Maths Puzzle Numerical Ability

Three times the larger numbers is equal to four times the smaller. The sum of the numbers is 21. Find the numbers.

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exam Other Question

Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular.
Please help!!!!!!! I need help learning fractions and geting them stuck in my memory. I have flunked more than 5 math tests because I forget the meterial.