exam Maths Puzzle Numerical Ability

Julius can paint a house three times faster than Ruben. working together, they can paint a house in 4 days. how long would it take the faster painter if he works alone?

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exam Other Question
Find the sum of all positive six digit intergers who digits are a permutation of the digits in the # 123,456 ... list them all. how do you find the area of a regular pentagon with radius 10cm?