Question

If 15 pens cost Rs. 35, what is the cost of 39 pens?

Answer 1

39x35
=1365
is cost of pen

Answer 2

Answer:

The cost of 39 pens will be Rs 91

Step-by-step explanation:

if the cost of 15 pens be Rs 35, then

using the unitary method we can find the

cost of one pen =35/15

cost of one pen =7/3

now we have to find the cost of 39 pens

according to the question,

So the cost of 39 pens will be,

=39*cost of one pen

=39*7/3

= 13*7

=91

The cost of 39 pens will be Rs 91.

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