3
Answer: DSet 3: Linear Inequalities (Advanced)
Explanation
PROBLEM
A painter can paint 20 sq ft/hr. To paint at least 450 sq ft, minimum hours?
A painter can paint 20 sq ft/hr. To paint at least 450 sq ft, minimum hours?
A.
25
B.
22
C.
20
D.✓ Correct
23
Detailed Explanation
Choice D is the best answer. 20h >= 450. h >= 22.5, so 23 hours
Why others are wrong:
A: 25 is incorrect because it does not satisfy the equation.
B: 22 is incorrect because it does not satisfy the equation.
C: 20 is incorrect because it does not satisfy the equation.