exam Maths Puzzle Numerical Ability

please show me how to do this.
Perform the indicated operations:
√[50] + 2√[32] - √[8]

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exam Other Question

56) Number problems. Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have? A mother is 30 years older than her daughter. Five years ago she was four times as old as her daughter. How old are they now?