exam Maths Puzzle Numerical Ability

What 2 digit is equal to three times the product of its digits?

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exam Other Question

The volume V of a gas varies inversely as the pressure P in it. The volume of a gas in 240cm^3 under a pressure of 23kg/cm^2. What will be its volume under a pressre of 30kg/cm^2? two angles of a triangle are 47 degrees and 74 degrees. what is the other?