Math, asked by avni1101, 1 year ago

the total cost of 6books and 7pens is 79rupees and the total cost of 7books and 5pens is 77rupees .find the cost of 1book and 2pens.

Answers

Answered by avinash0564

let's cost of book - x and pen -y
(6x+ 7y =79) ---1
(7x +5y =77)-----2

multiply equation 1 by 7 and equation 2 by 6
42x. + 49y = 553
42x. + 30y =462

subtract equation 1 by equation 2
19y = 91

y = 91/19
y= 4.78.

6x = 79- 7y
6x =46.25
x = 46.25/6
$46.25 \div 6 = 7.70$
price of 1 book and 2 pen is

7.70 + 2*4.78 =16.26

avinash0564: maybe. your given data is wrong check again

avinash0564: is there is any mistake so tell me where i will edit so that other students vorrect that

avinash0564: is there is any mistake so tell me where i will edit so that other students correct that

avinash0564: is there is any mistake so tell me where i will edit so that other students vorrect that

avinash0564: oops

avinash0564: question may be wrong wrong. x+2y = 2

avni1101: yes the written in my textbook is incorrect

avni1101: question

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