Answer: D 90
Step-by-step explanation:
One way to do this follows: Find the ratio, r, which when multiplied by each of the four numbers in the ratio produces the actual number of parts present:
4r + 11r + 9r + 6r = 60
Summing these up results in 30r = 60, so r is 2.
There are 4(2), or 8, nails,
11(2), or 22, screws,
9(2), or 18, washers, and
6(2), or 12, brackets.
Note that 8 + 22 + 18 + 12 = 60 (total number of parts)
If 5 carpenters have identical boxes, there will be 5(18), or 90, total washers.
