exam Maths Puzzle Numerical Ability

D=C-S/N (SOLVE FOR S) DEPRCIATION

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exam Other Question

Find the multiplicative inverse of 2.25

ok..I get that multiplicative inverse of 7 is 1/7 and 2/3 is 3/2...but I do not for some reasom get the the multiplicative inverse of 2.25!!!! Please explain thanks bob makes 20 drinks in five minutes, sarah makes 20 drinks in 10 minutes, and Gary makes 20 drinks in 15 minutes. How long will it take them to make the 20 drinks if they were working together?