Question

the product of two rational number is 21 if one of them is 7 find the other​

Answer 1

Answer:

Answer

Let the required number be x. Then,

=(5/7)+x=(4/21)

By sending (5/7) from left hand side to the right hand side it change to −(5/7)

x=(4/21)−(5/7)

LCM of 21 and 7 is 21

Express each of the given rational numbers with the above LCM as the common denominator.

Now,

(21×1)

(4×1)

=

21

4

=

(7×3)

(5×3)

=

21

15

Then,

=(4/21)−(15/21)

=(4−15)/21

=(−11/21)

Hence the required number is (−11/21)

Answer 2

Answer:

3

Step-by-step explanation:

if the product of two rational number is 21, if one is 7 then another should be number with which it makes 21. that is 3