1.

Cost of 5 books and 7 pens is Rs 79 and cost of 7 books and 5 pens is Rs 77 .Then find the cost of 2 books and 3 pens​

Answer»

Answer:

Let the cost of 1 BOOK =x

And the cost of 1 pen =y

⇒5x+7y=79

⇒7x+5y=77

Equation (1) × 7 : 35x+49y=79×7

Equation (2) × 5 : 35x+25y=77×5

Subtract two equations ;

⇒24y=168

⇒y=7

⇒x=6

Total cost of 1 book and 2 pens =x+2y=6+14=20


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