How much is a box of eggs?
On Sunday: I buy 3 Avocadoes, 1 box of eggs and 4 diet colas and it costs
£17
On Monday: I buy 2 Avocadoes, 2 boxes of eggs and 2 diet colas, it costs
£18
On Tuesday: I buy 1 Avocado, 3 Boxes of eggs and 2 diet colas and it costs
£23
How much does two boxes of eggs cost?
The answer is 12.
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1 solution
3 a + e + 4 c = 1 7 .... (i)
2 a + 2 e + 2 c = 1 8 .... (ii)
a + 3 e + 2 c = 2 3 .... (iii)
(ii) + (iii) - (i) :
4 e = 2 4
2 e = 1 2
Two boxes of eggs cost £12.