Question 629439
"what number is three more than twice the other number if the sum of the two numbers is 21"


x = one number
2x + 3 = other number   {one number is three more than twice the other}


x + 2x + 3 = 21   {their sum is 21}
3x + 3 = 21   {combined like terms}
3x = 18   {subtracted 3 from each side}
x = 6   {divided each side by 3}


2x + 3 {other number}
= 2(6) + 3   {substituted 6, in for x, into 2x + 3}
= 12 + 3   {multiplied}
= 15   {added}


one number is 6
other number is 15
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