Explanation:
For ratio questions, add up the both ratio to know the exact ratio, similar to percentage question.
5:8 total ratio is 13
Save ratio : 5/13
Spend ratio : 8/13
Saved money : 5/13 x 910 = 350
Spent money : 8/13 x 910 = 560
To double check answer, you can try add up the saved and spend money. If it gets to initial money 910, then its correct. Have fun learning ^-^