Question

A roof is supported o 7 rafter each 6 1/2 feet long at 70 cents running foot how much did those rafters cost

Answer 1

$31.85

Explanation:

total cost of the rafters = total length of rafters used x cost per foot

total length of rafters used = number of rafters used x length of rafters

7 x
`6(1)/(2)`

to solve, convert
`6(1)/(2)` to an improper fraction

to convert to improper fraction, take the following steps :

1. Multiply the whole number by the denominator

2. Add the numerator to the answer gotten in the previous step

3. divide the number gotten in the previous step by the denominator

7 x
`(13)/(2)` =
`(91)/(2)`

cost per foot = 70 cents

100 cents = 1 dollar

70 cents = $0.70

total cost of rafters = $0.70 x
`(91)/(2)` = $31.85