Question

5 pencils and 7 pens together cost rs 50 whereas 7 pencils and 5 pens together cost rs 46 find the cost of 2 pencils and 3 pen​

Answer 1

Answer:

I think the answer is 2 pencil cost is 8 rupees

and 3 pens cost is 12 rupees

total 8+12=20

Step-by-step explanation:

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Answer 2

Answer:

Let the cost of 1 pencil be x and the cost of a pen be y.

we get,

5x + 7y = 50 ..1

7x + 5y = 46 ..2

multiply equation 1 with 7

multiply equation 2 with 5, we get,

35x + 49y = 350 ..3

35x + 25y = 230 .. 4

we subtract equation 4 from 3, we get,

24y = 120

y = 120/24 = 5

put y=5 in equation 1, we get ,

5x + 7×5 = 50 , 5x = 50-35=15

x = 15/5 = 3

cost of 1 pencil = 3 rupees.

cost of 1 pen = 5 rupees.

so, cost of 2 pencils and 3 pens = 2x + 3y = 2×3 + 3×5 = 6+15  

= 21 rupees.

Step-by-step explanation:

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