book Maths Puzzle Numerical Ability

simplify: 2 square root of 5 - 3 square root of 36 + 5 square root of 35

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book Other Question

a load of 5kg stretches a spring to a length of 24 cm. a load of 8kg stretches it to a length of 30cm. find the length of the spring when there is no load. How do you find the average of a set of numbers?