Rates, SM-Bank 025

A laundromat can wash 12 loads of laundry in one hour at full capacity.

A standard load of laundry weighs 7 kilograms.

Here is some information about two different washing machines.

Washing machine	Amount of water used per kilogram of laundry (litres)
Top loader	10.25
Front loader	6.5

Working at full capacity, how many litres of water would the laundromat expect to save in one hour by using the front loader instead of the top loader? (2 marks)

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\(315\ \text{L}\)

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\(\text{Top loader water used (1 load)}\)

\(= 7\times 10.25\)

\(= 71.75\ \text{L}\)

\(\text{Front loader water used (1 load)}\)

\(= 7\times 6.5\)

\(= 45.5\ \text{L}\)

\(\therefore\ \text{Expected water saved}\)

\(= 12\times (71.75-45.5)\)

\(= 315\ \text{L}\)