Question

if the cost of 7books for 2 students are Rs1218 find the cost of 12 books for 5 students.​

Answer 1

Answer:

hello guys

Step-by-step explanation:

GIVEN: 7BOOKS AND 2STUDENTS =1218 TAKE AS 1

12BOOKS AND 5STUDENTS TAKE AS 2

NOW SUBSTRACT 1-2

BOOKS=X

STUDENTS =Y

7X+2Y=1218. REMEMBER - GOES TO +

12X+5Y=0. REMEMBER + GOES TO -

---------------

-5X-3Y=1218

REMEMBER ONLY 2ND CHANGES +,-

-5X-Y=1218/3

-5X-Y=406

-X-Y=406/5

-X-Y=81.1

X-Y=81.1