There were 33 minutes charged on the call.
Let the number of minutes be represented by m
Based on the information given, the equation to solve the question will be:
12.95 + (0.25 × m) = 21.20
12.95 + 0.25m = 21.20
Collect like terms
0.25m = 21.20 - 12.95
0.25m = 8.25
Divide both side by 0.25
0.25m/0.25 = 8.25/0.25
m = 33
Therefore, 33 minutes was charged on the call.
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