Question

10 books can be purchased from rupees 170 how many books can be purchased from rupees 425

Answer 1

 book can be purchased in 1 rupee = $\frac{10}{170}$ = $( \frac{1}{17} )$

Now,

Books can be Purchased in Rs 425 = $( \frac{425}{17} )$ = 25

i hope this will help you

-by ABHAY

Answer 2

$\frac{10}{x} = \frac{170}{425}$
cross multiplication
$\frac{10 \times 425}{170}$
425÷17=divide it