(ii) In 90 days, the gas used by a family cost $198.16 . Calculate the number of units of gas used.
total in CENTS = (n days x p per day) + (n units x p per unit)19816 = (90 X 24.5) + (y x 5.5)y = 3202 units
Related Maths GCSE answers
All answers ▸Make y the subject of the formula p=((x+y)/5)^(1/2)
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