book Maths Puzzle Numerical Ability

Increaing a number by five and then doubling the outcome is the same same as decresing the number by twelve

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book Other Question

A QDA instructor gave a class two tests. 25% of the class passed both tests and 42% passed the first test. What percentage of those who passed the first test also passed the second test? solve the polynominal equation 2x cubed=16x squared by factoring.