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5 pencils and 7 pens together cost rupees 50 whereas 7 pencils and 5 pens together cost rupees 46 find the cost of one pen and tha

By Aaliyah

5 pencils and 7 pens together cost rupees 50 whereas 7 pencils and 5 pens together cost rupees 46 find the cost of one pen and that of one pen​

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Aaliyah

let us calculate the number of years an amount becomes twice of its principal having the rate of simple interest of 6% per annum​

II. Short Answer Questions:
8. In a class of 25 students who participated in various competitions at the Independence
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  1. Answer:

    Cost of 1 pencil = Rs. 3 and Cost of 1 pen = Rs. 5

    Step-by-step explanation:

    Let us say that the cost of 1 pencil is x.

    And, the cost of 1 pen is y.

    Then, we will get two equations :-

    5x + 7y = 50 or 25x + 35y = 250

    7x + 5y = 46 or 49x + 35y = 322

    49x + 35y – 25x – 35y = 322 – 250

    24x = 72

    x = 3

    By putting the value of x in any equation, y = 5

    So, Cost of 1 pencil = Rs. 3 and Cost of 1 pen = Rs. 5

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