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Maths 3 Mark Question

Unitary Method · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 2 questions.

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3 Mark Question

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2 questions · self-marked practice — reveal the answer and mark yourself.

Question 13 Marks
52 packets of 12 pencils each, cost Rs. 499.20. Find the cost of 65 packets of 10 pencils each.
Answer
Total number of pencils in 52 packets of 12 pencils each = 52 × 12 = 624Cost of 624 pencils $=\text{Rs. }499.20$
Cost of 1 pencil $=\text{Rs.}\frac{499.20}{624}$
Now, Number of pencils in 65 packets of 10 pencils each = 65 × 10 = 650 pencils Therefore, cost of 650 pencils $=\text{Rs.}\frac{499.20}{624}\times650=\text{Rs. }520$
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Question 23 Marks
Fifteen post cards cost Rs. 2.25. What will be the cost of 36 post cards? How many postcards can we buy in Rs. 45?
Answer
Cost of 15 postcards = Rs. 2.25Cost of 1 postcard $=\text{Rs.}\frac{2.25}{15}=\text{Rs. }0.15$
Cost of 36 postcards $=\text{Rs.}\frac{2.25}{15}\times36=\text{Rs. }5.4$
As we know,
Number of postcards bought at Rs. 2.25 = 15
Number of postcards bought at Rs. 1 $=\frac{15}{2.25}$
Number of postcards bought at Rs. 45 $=\frac{15}{2.25}\times45=300$
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