Question

Cost of 3 pencil and 5 pens is 14 cost of 12 pencil and 20 pens

Answer 1

Answer:

Rs. 56 is the cost of 12 pencils and 20 pens.

Step-by-step explanation:

Let x be the cost of 1 pencil.

Let y be the cost of 1 pen.

So,

3x + 5y = 14 (Equation 1)

By multiplying both sides with 4, we get,

12x + 20y = 56 (Equation 2)

Now, if you observe Equation 2 carefully, you'll see it implies the cost of 12 pencils and 20 pens.

Thus the cost of 12 pencils and 20 pens is Rs. 56.

*The value of an equation doesn't change when equal no.s are multiplied/added/subtracted/or divided with on both sides.

Hope you'll understand it.