book Maths Puzzle Numerical Ability

Simplify the radicals....
radical sign 40 + radical sign 10 + radical sign 2/5

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book Other Question

What is the sum of the digits of the four-digit numbers formed using the digits
2,4,6,8(repetitions not allowed). How do you solve this with elimating the fractions first? 1/3p - 5 = 1/4p