exam Maths Puzzle Numerical Ability

Solve

5/4x = 3/x - 2

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exam Other Question

You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in our drawer. Linear Programming
C= 2x + 4y

constraints:
x < 3
x + y < 3
2x - 3y > -9

I'm lost!