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If Aarav finishes a job in 10 days and Diya in 15, how long together? Call the job 30 units (the LCM). Aarav does 3 units a day, Diya 2, so together 5 a day: 30 ÷ 5 = 6 days. No messy fractions!
✓ You passed this lesson’s test.
LCM units — “call the whole job the LCM of the days; then each person does a whole number of units a day”
Use it for: Group projects, workers and machines, and time-and-work questions in aptitude and scholarship tests.
Check: In 6 days Aarav does 6/10 and Diya 6/15 = 3/5 + 2/5 = the whole job ✓
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20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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