Question

If 10 pen cost 60 rupees what is the cost of 13 such pens

Answer 1

Answer:

Answer is 78

Step-by-step explanation:

10/60 = 13/x

10x = 780

x = 780/10

x = 78

Answer 2

Given:

The cost of 10 pens= Rs.60

To find:

The cost of 13 pens

Solution:

The cost of 13 such pens is Rs. 78.

We can find the cost by following the given steps-

We know that we can calculate the cost of one pen from the given cost of ten pens.

Let the cost of 1 pen be Rs. X

The cost of 10 pens= Rs.60

The cost of 1 pen= Rs. X

Using the unitary method, we get

Cost of 1 pen= X= 60/10

X= Rs.6

Now, to calculate the cost of 13 such pens, we need to multiply the cost of 1 pen by 13.

The cost of 1 pen=Rs.6

The cost of 13 pens= 13× the cost of 1 pen

=13×6

=Rs.78

Therefore, the cost of 13 such pens is Rs. 78.