exam Maths Puzzle Numerical Ability

Gail can type a chapter book in 4 hours jack can type a chapter book in 10 hours. How long would it take them to type a chapter book together?

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exam Other Question

whats the polynomials factor of x^2-7x+6 ? How do I solve a problem like this: 9a*9a*9a*9a*9a*9a?