Question

what number must be subtracted from each term of the ratio 19 : 21 to make 7 : 8

Answer 1

$\textbf{\underline{\underline{ANSWER}}}$

As given ;

What number should we subtract from the ratio 19 : 21 so, that it makes 7 : 8.
It means that we have to find out a number which should be subtracted from 19 : 21 to make it in the ratio 7 : 8.

Ratio that make 7 : 8 are :- 14 : 16, 21 : 24, 28 : 32 etc.
The nearest one is “14 : 16”

So, the number which should be subtracted= (19 - 14) and (21 - 16)

Condition is that if both the results are equal then only we can subtract them as told in question.

First result ;
= (19 - 14)
= 5

Second result ;
= (21 - 16)
= 5.

As 5 = 5, they can be subtracted.

$\textbf{So, your answer is :- 5.}$  

Answer 2

Step-by-step explanation:

It means that we have to find out a number which should be subtracted from 19 : 21 to make it in the ratio 7 : 8. Ratio that make 7 : 8 are :- 14 : 16, 21 : 24, 28 : 32 etc. Condition is that if both the results are equal then only we can subtract them as told in question. = 5.