Question

of 5 books cost ₹30, then what is the cost of 42 books?​

Answer 1

cost of 5 books= 30

$so \: cost \: of \: 1 \: book \: \\ = = > \frac{30}{5} = 6$

cost of 1 book is 6

so,

$cost \: of \: 42 \: books \: \\ = = \geqslant 42 \times 6 \\ = = \geqslant 252$