Answer:
17. C
18.G
Explanation:
17. According to the question, gravel is 4/13 of the total asphalt substance. One parking lot has 260 tons of asphalt. So this means there is 80 tons of gravel because 260 times 4/13=80. We need to find the tons of gravel if we made 3 parking lot. This means 3 parking lot is the same as 780. So we can just find the measure of gravel by multiplying
4/13 by 780.
So there is 240 tons of gravel. C is the answer.
18. Set up system of equations.
The ratio of a to c is 1:7 and the ratio of b to c is 3:7. Using this information,
- C is 7 times more than A.
- A is 3 times less than B
Using this info, we can make alternate equations
Subsitue this into the original equation,
We need to find c, c is 7 times more than a so c is
