book Maths Puzzle Numerical Ability

Jen works 7 hours a week more than Ben. Jen worked as much in 4 weeks as Ben works in 6 weeks. How many hours does each work per week?

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book Other Question
What is (i)^42.....is it (-1)? The sec theta = square root of 29 over 5, sin theta is negative. Find the other five functions (their exact value).