Problema Solution
Jack receives a weekly allowance of $8. Jack can earn $5 more for every 100 algebra problems he completes beyond the usual number. In 12 weeks Jack wants to have saved enough to buy new algebra books that cost $120. If he saves all of his money, how many algebra problems does he have to complete to earn what he needs?
Answer provided by our tutors
let x = the number of algebra problems beyond the usual number
12*8 + 5*(x/100) = 120
by solving we find
x = 480 problems
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Jack needs to complete 480 problems beyond the usual number in 12 weeks to save $120.