Question

Help!

i will report you if you give a bs answer :)

19. a certain chain saw requires a fuel mixture of 5.5% oil and the remainder gasoline. how many liters of 2.5% mixture and how many of 9% mixture must be combined to produce 40.0 liters of 5.5% mixture?

a. 12 4/23 liters of 2.5% and 28 19/23 liters of 9%
b. 28 19/23 liters of 2.5% and 12 4/23 liters of 9%
c. 21 liters of 2.5% and 18 liters of 9%
d. 18 6/13 liters of 2.5% and 21 7/13 liters of 9%
e. 21 7/13 liters of 2.5% and 18 6/13 liters of 9%
f. 18 7/13 liters of 2.5% and 21 6/13 liters of 9%

20. mary can row at the rate of 4 miles per hour in still water. rowing downstream in a river, she can travel 3 times as far in 1 hour as she can rowing upstream. what is the rate of flow in the river?

a. 1 miles per hour
b. 2.5 miles per hour
c. 4 miles per hour
d. 2 miles per hour
e. 3.5 miles per hour
f. 3 miles per hour

Answer 1

E

Explanation:

19) Amount of oil in = amount of oil in final product

.025(x) + .09(40-x) = .055(40) (x = 2.5% amt 40 - x = 9% amt)

x = 21.54 L of 2.5 % then 9% = 18.46 L