Betsy and Donovan made a meal together. Betsy's part took 18 minutes longer than Donovan's part. The meal was made in 98 minutes. How many minutes long was Betsy's part?
Let D = Donovan's time in minutes.
Betsy = D + 
<gadget id="calculator">+18</gadget>
<output>18</output>
18
2D + 18 = 98
2D = 80.
D = 
<gadget id="calculator">40</gadget>
<output>40</output>
40.
Betsy = 40 + 18 = 
<gadget id="calculator">40+18</gadget>
<output>58</output>
58 minutes.
Betsy's part took 58 minutes.

<result>58</result>