Miss Grayson's class raised $50 for their field trip. Aside from that, each of her students contributed $5 each. There are 20 students in her class, and the cost of the trip is $7 for each student. After all the field trip costs were paid, how much is left in Miss Grayson's class fund?
Let's think step by step.
10
The contribution of the students amounted to $5 x 20 = $100.

So Miss Grayson's class had $100 + $50 = $150 in all.

The cost of the field trip amounted to $7 x 20 = $140.

Therefore, the class of Miss Grayson is left with $150 - $140 = $10.

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So, the answer is 10