3 Marks Question

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 $= 52 \times 12 = 624$
Cost 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 $= 65 \times 10 = 650$ 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 $= Rs. 2.25$
Cost 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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Maths 3 Marks Question

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