Jean’s mother purchases 43 lemons. She used a lot of them to make the lemonade. She has 16 left. How many lemons did she use to make the lemonade?
Which equation models the problem?

Hint:

In the question Jean's mother purchases 43 lemons and at last she is left with 16 lemons which means number of lemons which she used should be subtracted from total lemons to get the numbers of lemons left. So the equation should also show total lemons minus used lemons gives left lemons.