book Maths Puzzle Numerical Ability

If x/y=4/7 and y/z=14/3.What is the value of [x+y]/z? could you solve this?

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book Other Question

I need to write the following in exponential form. What does this mean?
^3 square root of x^2y^3 Can someone help me solve this problem?

A community service organization has 16 men and 15 women in its membership. How do I write the ratio of women to men?

Thanks,
Sher