Question

How many times does christine tune up her bike each year

Answer 1

80(miles) x 52(weeks in a year) = 4160(miles in a year)

4160 / 4(tunes in a year) = 1040(miles to go before a tune)

Now for Christine

100(miles) x 52(weeks in a year) = 5200(miles in a year)

5200 / 1040(miles to go before a tune) = 5(tunes in a year)

Answer C. 5