Answer:
x = 23
Step-by-step explanation:
180 - 65 = 115
115/5 = 23
3x+67=130
3x=63
x=21
Your answer is 21.
Let's look at each answer separately:
A: we can't say that 1.3 cubic feet is about 1 cubic foot (there's a difference of 0.3 feet) and that 8 bags will give us a little less than 8 cubic feet - if we calculate 8*1.3 that'd give 10.4 cubic feet, which is much more than required
B: 2 bags will not give him a little less than 3 cubic feet (there's a difference of 0.6 feet) and so 6 bags will not give him a bit more than 8 cubic feet - if we calculate 1.3*6 we get 7.8 cubic feet, which is not enough
C: This answer is the most reasonable since the amount in 3 bags (3*1.3 = 3.9 cubic feet) is very close to 4 cubic feet, and so 6 bags would give him a little less than 8 cubic feet and thus he would require 7 bags
Answer:
15 hours of work would both plumbers charge the same amount of money for the job.
Step-by-step explanation:
Let us assume the number of hours Richard works = m
Per hour charge = $45
So, the charge for working m hours = m x $45 = 45 m ....... (1)
Let us assume the number of hours Spiro works = m
Per hour charge = $35
So, the charge for working m hours = m x $35 = 35 m
Also, the charge for parts = $150
So, total amount Spiro charges = Cost for m hours + Charge for parts
= 35 m + $150 ...... (2)
Now, for m hours as they charge the SAME AMOUNT.
⇒ From (1) and (2), we get
45 m = 35 m + $150
or, 45 m - 35 m = 150
or, 10 m = 150
⇒ m = 150/10 = 15
or, m = 15
Hence, 15 hours of work would both plumbers charge the same amount of money for the job.