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