Question

The total cost of 6 books and 7 pens is ₹79 and total cost of 7 books and 5 pens is ₹77.Find the cost of 1 book and 2 pens


please solve with steps

Answer 1

Answer:

8.05

Step-by-step explanation:

let x be books

y be pens

6x+7y = 79........(1)

7x+5y = 77.......(2)

so, multiply eqn (1) with 5 & eqn (2) with 7

and subtract (2) from (1)

30x+35y = 395

49x+35y = 539

by solving

-19x + 0 = - 144

x = 7.57

putting value of x in eqn (1)

6*7.57+7y = 79

y = 0.24

so, x+2y = ?

7.57+2*0.24=8.05

we get x=