Question

find their ages.
3
of the other.
Divide Rs. 21 into two parts so that one is 3/4 of the other​

Answer 1

Let x and y be the two parts.

 

We know that x + y = 21.

 

x = (3/4)y  one is 3/4 of the other

 

Now use the first equation and substitute the second equation into it.

 

x + y = 21

 

(3/4)y + y = 21

 

Now combine like terms...

 

(7/4)y = 21

 

y = 21/(7/4)   can be re-written as 21/1.75 = 12

 

So if y = 12, look at either equation and substitute in 12 in place of y.

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Answer 2

Step-by-step explanation:

3/4x+x= 21

(3x+4x)/4=21

7x/4=21

x=12

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