David can proofread15 reports in an hour while Armando can proofread 37reports in an hour. If they have 400 reports to proofread
2 answers:
Answer:
Step-by-step explanation:
Given,
The number of reports proofread by David in one hour = 15,
While, the number of reports proofread by Armando in one hour = 37,
Total reports proofread by both of them in one hour = 15 + 37 = 52,
Also, the number of reports have to be proofread = 400
Hence, the time taken by both of them when they work together
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Answer:
56
Step-by-step explanation:
First, convert the 70% so that we can use it with the 80 cups. To do this, convert the percent to a decimal by moving the decimal 2 spaces to the left:
70% → 70.00 → 0.70 → 0.7
70% percent can be seen as 0.7. Multiply this by 80:
So, 70% of 80 is 56. Desmond sold 56 cups on the second Saturday.
:Done
Answer:
314 ft²
Step-by-step explanation:
Data provided in the question:
Depth (height) of the pool = of its radius
let the radius be 'r' ft
thus,
Depth (height) of the pool, h = ft
Volume of the pool = 1570 ft³
also,
Volume of cylinder = πr²h
thus,
1570 ft³ = πr²h
or
1570 ft³ =
or
3140 = 3.14 × r³ [ π = 3.14 ]
or
r³ = 1000 ft³
or
r = 10 ft
Thus,
Area of the bottom surface = πr²
= 3.14 × 10²
= 314 ft²