Answer:
15 weeks
Step-by-step explanation:
From the second to fifth week, her grade increased from 67% to 73%. Calculate how much her grade increased. Subtract the grades
73% - 67% = 6%
Calculate how long it took to increase by that much. Subtract the weeks
5 - 2 = 3 weeks
It took 3 weeks to increase 6%.
Find the <u>rate</u> of increase per week. Divide the grade increase by time
6% ÷ 3wk = 2%/wk
Calculate how much her grade needs to increase from 73%.
93% - 73% = 20%
Divide how much the grade needs to increase by the rate to find the number of weeks.
20% ÷ 2%/wk = 10 weeks
Since she has 73% at 5 weeks, add 5 weeks to 10 weeks.
5 + 10 = 15
It will take 15 weeks for the student to have a 93% in class.
