Answer:
27.7
Step-by-step explanation:
Pythagorean Theorem
- = (10.7 comes from half of the 21.4 side)
= height
70 gallons
x gallon of 50%
x * 0.5 + 70 * 0.3 = (x + 70) * 0.4
0.5x + 21 = 0.4x + 28
0.1x = 7
x = 70
14^15/14^5 = 14^(15-5) = 14^10