Question

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

Answer 1

The answer is: " 100 " .
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Step-by-step explanation:
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10x + 10(x+1) = 210 ; Find "10x" ;

10x + 10x + 10 = 210 ;

20x + 10 = 210 ;

Subtract "10" from each side of the equation;

20x + 10 - 10 = 210 - 10 ;

20x = 200 ;

Divide EACH side of the equation by "20" ; to isolate "x" on one side of the equation; and to solve for "x" ;

20x / 20 = 200 / 20 ;

x = 10
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Solve for "10x"; the smaller multiple;

10x = 10 * x = 10 * 10 = 100 .
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The answer is: " 100 " .
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Answer 2

Guessing but 2x+10=210?  Then 2x=200, x=100.