Susan can type 10 pages in 5 minutes. Mary can type 5 pages in 10 minutes.…
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Susan can type 10 pages in 5 minutes. Mary can type 5 pages in 10 minutes. Working together, how many pages can they type in 30 minutes?
Answer: D. 75 — Solution: Susan's rate: 10 pages in 5 minutes → 10/5 = 2 pages per minute. In 30 minutes she types 2 × 30 = 60 pages. Mary's rate: 5 pages in 10 minutes →…
- A.
15
- B.
20
- C.
25
- D.
75
Attempted by 81 students.
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Correct answer: D
Solution:
Susan's rate: 10 pages in 5 minutes → 10/5 = 2 pages per minute. In 30 minutes she types 2 × 30 = 60 pages.
Mary's rate: 5 pages in 10 minutes → 5/10 = 0.5 pages per minute. In 30 minutes she types 0.5 × 30 = 15 pages.
Total pages in 30 minutes = 60 + 15 = 75 pages. Therefore, together they type 75 pages in 30 minutes.
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