Question

3 books & lopens together cost a Rs. 300. 2 books & 3 pens cost Rs. 145. Find cost of 1 book & 3 pens.
plzzzzz answer me quickly
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Answer 1

Answer:

1 pen cost 15. 15×3=45.1 book cost =50.

Answer 2

Answer:

Their is ur answer

3x+10y=300........(I)

2x+3y=145.........(II)

Multiplying the equ. (I) by 3 and equ. (II) by 10.

= 9x + 30y = 900

– 20x + 30y = 1450

– – –

__________________

11x + 0 = 550

x = 550

_____

11

x = 50

·

. . Cost of 1 book is ₹50.

Cost of 3 pens = 3 (15)

= 45

·

. . Cost of 3 pens is ₹45.