book Maths Puzzle Numerical Ability

List all the prime numbers between 45 and 80.

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book Other Question

How do you solve a problem like this
a square root symbol, then a 63x to the 15th power y to the 9th power. all over 7xy to the 2nd power? Jamar is 4 times as old as Josh. In 20 years he will be twice as old as Josh. How old is Jamar ?