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

Question

nignag [31]

3 years ago

8

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)

Mathematics

1 answer:

myrzilka [38] · Answer 1 · 2022-07-28T07:49:01+03:00

myrzilka [38]3 years ago

7 0

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