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30 children are going on a trip. It costs £5 including lunch. Some children take their own packed lunch. They pay only £3.the 30 children pay a total of £110. How many children a…

30 children are going on a trip. It costs £5 including lunch. Some children take their own packed lunch. They pay only £3.the 30 children pay a total of £110. How many children a…
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30 children are going on a trip. It costs £5 including lunch. Some children take their own packed lunch. They pay only £3.the 30 children pay a total of £110.

How many children are taking their own packed lunch?
(please show your working)

User Panya
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7.8k points

1 Answer

6 votes
110 = 5x + 3y (yet x + y = 30)
Therefore the only explanation would 10 kids bought lunch and 20 packed because....
10 + 20 = 30 AND 5 * 10 = 50 3 * 20 = 60 60 + 50 = 110
User Gennady Dogaev
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8.2k points
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