Ram worked on a set of mathematics problems for 20 minutes and finished of it. He then asked 4 - 15 Mohan to join him. Working together, they finished the remaining set in 22 minutes. How long would Ram and Mohan have taken to finish the set if they worked alone?
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Step-by-step explanation:
A group of 630 children is arranged in rows for a group photograph session. Each row contains three fewer children than the row in front of it. What number of rows is not possible?
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