exam Maths Puzzle Numerical Ability

LINEAR WORD PROBLEMS
1. Kara and Bill spend $400 on gifts. Bill spent three-fifths of what Kara spent. How much did each spend? (Bill $150, Kara $250)

2. Jim is planning to b

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exam Other Question
if x is real and s=4x^2+3/2x-1, prove that s^2-4s-12 greater than equal to 0. Complete the proof

(a exponent3 + b exponent 3)*(a+b)=a exponent2 - ab+b exponent 2