mohammedammar mohammedammar

06-04-2015
Mathematics

Answered

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 kaybay99

06-04-2015

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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