Question

The cost of 5 pens is equal to the cost of 15 pencils. How many pens can be exchnged for 90 pencils?​

Answer 1

Answer:

5 pens = 15 pens

Step-by-step explanation:

then 15 ÷ 90

= 6

then 5 × 6

= 30

Answer 2

30 pens can be exchanged for 90 pencils.

Given:

The cost of five pens = The cost of 15 pencils.

To Find:

The number of pens.

Solution:

Let M denotes pencils and N denotes pens.

Given that,

The cost of five pens = The cost of 15 pencils.

5×N = 15×M

N = $\frac{15}{5} \times M$

N= 3×M

⇒The cost of one pen = The cost of three pencils

For N pens ,90 pencils were brought.

⇒ N = 90/ 3       (By cross multiplication)

N = 30.

Therefore, 30 pens can be exchanged for 90 pencils.

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Learn More:

1)Reena has pens and pencils which together are 40 in number. If she has 5 more pencils and 5 less pens, then number of pencils would become 4 times the number of pens. Find the original number of pens and pencils

Link:https://brainly.in/textbook-solutions/q-reena-pens-pencils-40-number-5-pencils?source=qa-qp-match

2) A pen costs twice as much of a pencil. If 18 pens and 24 pencils costs ₹180, find the cost of a pen and the cost of a pencil.

Link:https://brainly.in/question/49539049