book Maths Puzzle Numerical Ability

Please help with impossible money question: An investor placed a total of $10,000 in two simple interest accounts. One account earned a simple interest rate of 6.7%, and the othe

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aw^2-8b+2bw^2-4a If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?