book Maths Puzzle Numerical Ability

build up each fraction or whole number so that it is equivalent to the fraction with the indicated denominator.

5/7=?/100

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book Other Question

Please help me rationalize the expression 2sqrt3+sqrt2/sqrt3-sqrt2 so there are no radicals in the denominator. I came up with 4-sqrt6
Thanks a lot Need help with this, The inlet pipe of an oil tank can fill the tank in 1 hour, 30 minutes. The outlet pipe can empty the tank in 1 hour. How long does it take to empty the tank if both pipes are open?