Step-by-step explanation:
Let x represent the number.
We have 2x + 18 = 3x - 5, therefore x = 23.
The number is 23.
Answer:
12.2 gallons for $1.87, I would spend probably 2.87 for 24.4 gallons
= x(a+b)(a-b) . x(b+c)(b-c) .x(c+a)(c-a)