book Maths Puzzle Numerical Ability

Use the indicated property to write an expression that is equivalent to the following expression.

(7 + 11) + 2 (associative property of addition)

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book Other Question

(x^2+2)^2

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4 men and 3 women finish a job in 6 days,and 5 men and 7 women can do the same work in 4 days.how long will 1 man and 1 woman take to do the work?