Which deal costs less per litre?
A) $32 for 4 L
B) $8.50 for 1 L
Predict: I thought this question would be about division or multiplication.
Clarify: I had nothing to clarify.
Find the big picture: What deal is cheaper per litre?
First I worked what 8.50 x 4 was, because it was only 1 litre, and the other deal was 4 litres, and 8.50 x 4 was $33.50 for 4 L.
So A is $32 per 4 litres, and B is $33.50 per 4 litres. So A is the answer, because it is $1.50 less than B per 4 litres.
Summary: I used the work backwards method.