the total cost of 8 books and 5 pens is 420 and the total cost of 5 books and 8pens is 321 find the cost of 1 book and 2 pens
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Answers
Answered by
14
let cost on book be x and pen be y
8x + 5y = 420
5x+8y=321
add both
13x+13y= 741
subtract
3x - 3y =99
x - y = 11
13x - 13y = 143. × by 13
now add
13x+13y=741
13x - 13y = 143
26x= 884
x = 34
y= 23
coat of one book is 34 rs and two pens is rs 46 and total is 80 rs
8x + 5y = 420
5x+8y=321
add both
13x+13y= 741
subtract
3x - 3y =99
x - y = 11
13x - 13y = 143. × by 13
now add
13x+13y=741
13x - 13y = 143
26x= 884
x = 34
y= 23
coat of one book is 34 rs and two pens is rs 46 and total is 80 rs
Answered by
6
Answer:
the cost of one is 34 and two pens is 46 .80
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