exam Maths Puzzle Numerical Ability

WHAT IS A IS THE SET OF WHOLE NUMBERS LESS THAN 5
'' '' B IS THE SET OF NATURAL NUMBERS LES THAN 25
'' '' D IS THE SET OF NATURAL NUMBERS LES THAN 5
'' '' C IS THE SET OF INTEGE

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exam Other Question

20x+50 over 15x-30

I have to simplify this. Here is what I did:

((20+50))/((15x-30)) = ((4x+10))/((3x-6)) = ((2(2x+5)))/((3(x-2)))

Please tell me if this is right. I hope so! This is for a test. Determine the sum of the geometric series 27+18+12+8+...