Answer:

2m + m = 60

Step-by-step explanation:

if you need to solve for m (or Rina's sister age) solution below:

2m + m = 60

3m = 60

3m/3 = 60/3

m = 20 Rina's sister age

Rina's age = 2m

2(20) = 40

To check given m = 20

2m + m = 60

2(20) + 20= 60

40 + 20 = 60

60 = 60

don't forget to double check, hope this helps :)

Answer:

30 is the age of Rina's sister

Step-by-step explanation:

m = 60 ÷ 2 = 30

m= 30

Correct me if i'm wrong

HOPE IT HELPS