Problema Solution
15 people volunteer for a park cleanup. the number of volunteers increases by 7 people each month. After how many months will there be 50 volunteers?
Answer provided by our tutors
After the 1st month the number of volunteers is: 15 + 7
After the 2nd month the number of volunteers is: 15 + 7 + 7 = 15 + 2*7
After the 3rd month the number of volunteers is: 15 + 2*7 + 7 = 15 + 3*7
......
After the nth month the number of volunteers is: 15 + 7n
We need to find n such that:
15 + 7n = 50
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click here to see the equation solved for n
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n = 5 months
After 5 months the number of volunteers is 50.