weight of 72 books is 9 kg.what is the weight of 80such books? How many such books would weigh 6kg?
Answers
Answered by
2
Hi ,
Let number of books = x ,
Their weight = y
x is directly proportional to y
x1 = 72 , y1 = 9 kg
x2 = 80 , y2 = ?
Therefore ,
x1/y1 = x2/y2
y2 = ( x2 y1 ) / x1
= ( 80 × 9 ) / 72
= 80 / 8
= 10 kg
Therefore ,
. weight of 80 such books = y2 = 10kg.
***********
x1 = 72 , y1 = 9 kg
x2 = ? , y2 = 6 kg
x2 = x1 × y2 / y1
= ( 72 × 6 ) / 9
= 8 × 6
= 48
Therefore ,
48 books weight = 6kg
I hope this helps you.
:)
Let number of books = x ,
Their weight = y
x is directly proportional to y
x1 = 72 , y1 = 9 kg
x2 = 80 , y2 = ?
Therefore ,
x1/y1 = x2/y2
y2 = ( x2 y1 ) / x1
= ( 80 × 9 ) / 72
= 80 / 8
= 10 kg
Therefore ,
. weight of 80 such books = y2 = 10kg.
***********
x1 = 72 , y1 = 9 kg
x2 = ? , y2 = 6 kg
x2 = x1 × y2 / y1
= ( 72 × 6 ) / 9
= 8 × 6
= 48
Therefore ,
48 books weight = 6kg
I hope this helps you.
:)
Similar questions