Mixture problem.
Ratio of 20% : 50% acids
=50-39 : 39-20
=11:19
total volume
=400L
vol. of 20% acid=400*(11/(11+19)=400*(11/30)=146.667 L
vol. of 50% acid=400*(19/(11+19)=253.333 L
Alternatively, use c=volume of 20%, d=vol of 50%
then
0.2c+0.5d=400*0.39
Since c+d=400, we have
0.2c+0.5(400-c)=400*0.39=156
solve for c:
0.3c=44
c=146.667 and d=400-c=253.333 as before.
<h2>Vertical distance gained from takeoff is 493.72 ft</h2>
Step-by-step explanation:
Refer the figure.
Horizontal distance = AB = 2800 ft
Angle = ∠B = 10°
We need to find AC that is h.
We have

Vertical distance gained from takeoff = 493.72 ft
There are 2 half-miles in a mile. Thus, doubling 8.5 minutes will give you the answer.

minutes per mile or .17 miles per minute.
Ok so
18 - 1 = 17
17 - 2 = 15
15/3 = 5
she can carry 5 books
Answer:
x=21°
Step-by-step explanation:
64°=3x+1 --------- because vertically opposite angles are equal
63=3x
x= 63/3
x=21°