Question

by what number should we multiply-4/35 to get 8/105

Answer 1

Let the number be a

$\frac{ - 4}{35} \times a = \frac{8}{105} \\ a = \frac{8}{105} \times \frac{ - 35}{4} \\ a = \frac{2}{21} \times - 7 \\ a = \frac{ - 2}{3}$
Required number = - 2/3

Answer 2

let a number be 'x'
so,

x*-4/35=8/105
x=8*35/105*-4
x=280/-420
x= -14*20/21*20
x= -14/21
x= -2/3