Brenda weighs 10 pounds more than 3 times Mel's weight. If Brenda weighs 220 pounds, what is Mel's weight?
Let Mel's weight be m.
Brenda's weight is 3*m + 10 = 220 pounds.
Thus 3m = 220 - 10 = 210 pounds.
Therefore Mel's weight is m = 210/3 = 
<gadget id="calculator">210/3</gadget>
<output>70</output>
70 pounds.

<result>70</result>