The sum of a number and its double is 69. What is the number?
A.) 46.6
B.) 34.5
C.) 23
D.) 20
A.) 46.6
B.) 34.5
C.) 23
D.) 20
x = the number
2x = its double {double a number is multiplying by 2}
x + 2x = 69 {the sum of a number and its double is 69}
3x = 69 {combined like terms}
x = 23 {divided each side by 3}
C.) 23
Check
- the sum of 23 and its double, 46, is 69
23 + 46 = 69 ☑
- Algebra House
2x = its double {double a number is multiplying by 2}
x + 2x = 69 {the sum of a number and its double is 69}
3x = 69 {combined like terms}
x = 23 {divided each side by 3}
C.) 23
Check
- the sum of 23 and its double, 46, is 69
23 + 46 = 69 ☑
- Algebra House