Question

The sum of two number is 200. if one number is 9 time the other, find the number.

Answer 1

Let The 1st No. Be x
Then 2nd No. Be 9x

ATQ
9x+x =200
10x =200
x =20

Nos. Are x=20
9x=9×20=180



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Answer 2

Let the two numbers be x and y respectively

Now,
x + y = 200......1
x = 9y......2

Now
substituting the value of x = 9y in equation 1

9y + y = 200
10 y = 200
y = 20

Now
Substituting the value of y = 20
in equation 1
you get

x + y = 200
x + 20 = 200
x = 180

So the two numbers are 20 & 180.