Question

Ms Sharp baked 21 trays of cookies with 35 cookies on each trays if she needs to bake 840 cookies how many more trays will she need to make ​

Answer 1

3 more trays

Explanation:

At 35 cookies per tray, x trays is sufficient for an output of 840 cookies. Dividing 840 cookies by 35 cookies/tray, we get 24 trays.

But Ms. Sharp already has 21 trays.

Thus, she needs 3 more to be able to bake 840 cookies.