P3 Work Backwards

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A bus started it's journey from a bus interchange. At the first stop, 1/3 of the passengers alighted and 18 people boarded. At the next stop, 1/4 of the new total number of passengers alighted and 9 people boarded. Now there are 60 passengers. How many passengers started the trip from the bus interchange? 3u -1u 2 u +18 4u -1u 3 u +9 60 - 9 3u-->60-9=51 1 u-->51/3=17 4u-->17x4=68 (68) -18 2 u-->68-18=50 1u-->50/2=25 3 u-->25x3=75 ( ans )

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