The sum of two consecuutive multiples of 10 is 210. find the smaller multiple.

The answer is:  " 100 " .

Explanation:

  10x + 10(x + 1) = 210 ;  Solve for "10x" ;

  10x + 10x + 10 = 210 ;

    20x + 10 = 210 ;

Subtract "10" from each side of the equation;

    20x + 10 - 10 = 210 - 10 ;

to get:  20x = 200 ;

Divide EACH SIDE of the equation by "20" ; 

      20x / 20 = 200 / 20 ;

   to get:  x = 10 ;

Now; solve for "10x" ;

10x = 10 * x  = 10 * 10 = 100.

The answer is:  " 100 " .

In this problem it decreased 20%