Question

If the product of two rational number is 25 by 42 and one of them is-16/7, find the other.

Answer 1

Product of two rational no.s = 25/42 
One of the two no.s = 16/7
Let the other one be x.
Then x * (16/7)= 25/42
⇒x=(25/42)/(16/7)=25/96(Ans)

Answer 2

Let the other number is x,


According to the question :




Product of the numbers = 25/42



$- \frac{16}{7} \times x = \frac{25}{42} \\ \\ \\ \\ x = \frac{25}{42} \times ( - \frac{7}{16} ) \\ \\ \\ => x = \frac{ - 25}{128}$



Hence, -25/128 is the other number