exam Maths Puzzle Numerical Ability

I have to combine if possible no calculator or table of roots to be used...Can you help me please? Thanks...:)

Page 530
Number 20

6square5y - square root 20y

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exam Other Question
A car travels 100 mph for the first half of a 400 mile race. How fast must the car go to average 200 mph? Simplify: -(-25).