Question

the weight of 90 books is 50 kg find the weight of 180 such books ​

Answer 1

Answer:

$the \: weight \: of \: 90 \: books \: \: = 50 \: kg \\ the \: weight \: of \: 180 \: books = x \\ therefore \: 180 \: books \: \: \: \: \: \: \: = 50 \times 180 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x= 9000 \: kg$