If cost of 12 pens is Rs84. then what is the cost of 10 such pens ?

Options

A. ? 90
B. ? 72
C. ? 65
D. ?70

Answer

To solve the problem step by step, we can follow these instructions:

### Step 1: Find the cost of one pen
Given that the cost of 12 pens is Rs. 84, we can find the cost of one pen by dividing the total cost by the number of pens.

\[ \text{Cost of 1 pen} = \frac{\text{Total cost of 12 pens}}{\text{Number of pens}} = \frac{84}{12} = 7 \text{ Rs.} \]

### Step 2: Calculate the cost of 10 pens
Now that we know the cost of one pen is Rs. 7, we can find the cost of 10 pens by multiplying the cost of one pen by 10.

\[ \text{Cost of 10 pens} = \text{Cost of 1 pen} \times 10 = 7 \times 10 = 70 \text{ Rs.} \]

### Final Answer
Therefore, the cost of 10 such pens is Rs. 70.

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