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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)



Answer :

kaybay99
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

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