Two bikers start at opposite ends of a trail and bike toward

Two bikers start at opposite ends of a trail and bike toward each other and they meet in 5 hours. Find the amount of a 12% saline solution a lab assistant should 22% saline solution in order to have a 16% solution.

Solution

27) Biker 1 speed = x mph

Biker 2 speed = y mph

given : y = 2x

distance travelled by two in 5hrs

d1 = x*5 = 5x

; d2 = 2x*5 = 10x

total distance travelled by two = 225 miles

5x +10x = 225

x = 15 mph

2x = 30 mph

Option D

28) Let x cc of 12 % saline is used

12% sale = 0.12x

Total solution = x +80

22% saline solution = 0.22*80 = 17.6 cc

(0.12x +17.6)/(x +80) = 0.16

0.12x +17.6 = 0.16x + 12.8

0.04x = 4.8

4x/100 = 4.8

x = 480/4 = 120 cc

Option D