Question

Q.3 Solve the following problems : 1.If the cost of 10 pens is Rs.70. What is the cost of 15 such Pens? ​

Answer 1

cost of 1 pen = 70/10

                    = Rs.7

cost of 15 pens = 7*15

                         = 105

Answer 2

Answer:

∴ The cost of $15$ pens is Rs. $105$.

Step-by-step explanation:

• In context with question asked,
• We have to find the cost of $15$ Pens.
• It is given that, the cost of $10$ pens = Rs. $70$
• To find the cost of $15$ Pens, we have to first find the cost of $1$ pen.
• To find the cost of $1$ pen, divide the total price of $10$ pens by number of pens.
• So,

         Cost of $1$ pen = $\frac{70}{10}$

                             = Rs. $7$

• Now, by multiplying the cost of $1$ pen by number of pens, we can find the cost of $15$ such Pens.

         Cost of $15$ pen = $15\times 7$

                               = Rs. $105$

• ∴ The cost of $15$ pens is Rs. $105$.