exam Maths Puzzle Numerical Ability

In the original direct distance dialing plan the second digit of the area code was always either zero or one. How many different ten-digit phone numbers were possible with the this

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exam Other Question

How do you convert .72 1/3 into a percent and a decimal. I think it is in fraction form. But I did not consider the decimal in front of 72. simplify the following expressions. do not give decimal approx

(32x to -5th power)-1/5

(so to be explain it, its 32x to the -5the power in parenthesis, to the -1/5)