78 = 1.50x + 2.50x + 4(x/2)) + 3((x/2) + 1))
78 = 4x + 4(x/2) + 3((x/2)+1)
78 = 4x + 2x + (3(x/2) + 3)
78 = 6x + 1.5x + 3
75 = 7.5x
10 = x
Mr. Abernathy bought 10 wrenches at $1.50, 10 wrenches at $2.50, 5 wrenches at $4, and 6 wrenches at $3.
Answer:
The answer is C
Step-by-step explanation:
<span>Step 1: 0.225 = 225⁄1000</span>
<span>Step 2: Simplify 225⁄1000 = 9⁄40</span><span> </span>
7y + 10x = 99
y - x = 2
y = 7 , x = 5