The total time needed for Elizabeth on the practice is 130 minutes.
It should be noted that Elizabeth spent 91 minutes, which was 70 percent of her study time for her language exam,
Let the total time be represented by x.
Therefore, 70% × x = 91
0.7 × x = 91
0.7x = 91
Divide
x = 91/0.7
x = 130
The total time needed is 130 minutes.
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The tape diagram shows that Elizabeth spent 91 minutes, which was 70 percent of her study time for her language exam, on conversation practice. What was the total time needed?