I tried doing the method my teacher taught me but i keep getting it wrong ​

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

47 - 90 = 43

43 - 180 = x

x = 137