A decrease in the ratio 4:5 implies that :
New quantity:Old quantity = 4:5
Let the new quantity be 





So, the new quantity is 32
12 plus 12 (walk to and from her grandparents) times 2 (two times a week she goes) equals 48. So, she spends 48 minutes walking between the two houses.
Answer:
2x=x+x doesn't belong
Step-by-step explanation: