Question

21 pens and 29 pencil cost 79 but if number of pen and pencil are exchanged and the cost would have reduced by 8 find the cost of each pen
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Answer 1

Let x be the cost of each pencil and y be the cost of each pen,

Since, 21 pencils and 29 pens cost rs 79

⇒ 21x+29y = 79 -----(1)

Also, 29 pencils and 21 pens cost rs 71

⇒ 29x + 21y = 71 -----(2),

29 × equation (1) - 21 × equation (2),

841y - 441y = 2291 - 1491841y−441y=2291−1491

400y = 800400y=800

\implies y = 2⟹y=2

Hence, the cost of each pen is 2 rupees.

hope it helps...........

Answer 2

Answer:

thankyou for the answer