If 6 pens cost ₹90, one pen costs ₹90 ÷ 6 = ₹15, so 10 pens cost ₹150. That is the unitary method: always go through “one”. When more workers need fewer days, it works the other way round (inverse).
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Lesson 7 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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