Campus Maths Puzzle Numerical Ability Arithmetic

What is square root of 0.4?

Read Solution (Total 3)

root of 0.4=10/25
=root of 10/5
=3.16/5
=0.6324
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sqrt(.4)=2/sqrt(10)=2/3.16=.63
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sqrt(.4)=2/sqrt(10)=2/3.16=.63
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Campus Other Question

a + a^1 +a^2+......+a^28 =?? if a=3 A car is travelling at a uniform speed. The driver sees a milestone showing a 2-digit number. After travelling for an hour the driver sees another milestone with the same digits in reverse order. After another hour the driver sees another milestone containing the same two digits. What is the average speed of the driver.