Question

Lana is the oldest of four sisters. Her youngest sister is half her age. The other two sisters are twins 2 years younger than Lana. When the four sisters' ages are added together, the result is 45. If the youngest sister is n years old, what is n?

Answer 1

youngest sister is n
oldest-Lana =2n
twin 1= 2n -2
twin 2= 2n-2

n+2n + 2n-2 + 2n-2 = 45 add all together
7n -4 =45 combining

can you solve now??