book Maths Puzzle Numerical Ability

Factor 140 into a product of prime factors.

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book Other Question

Tim is twice as old as his son. In 6 yrs Tim’s age will be three times what his sons age was 6 years ago. How old is Tim’s son now?

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Solve the quadratic equation by factoring and applying the property "ab=0 if and only if a=0 or b=0"

(x^2)+3kx-(10k^2)=0