Answer:
4+x
Step-by-step explanation:

Answer: the answer is 1x+5y=17
Step-by-step explanation: I'm thinking this is the correct answer if not I'm sorry
When you are 10 years ,your sister will be 10/2 = 5 years
10 - 5 = 5
Your sister is 5 years younger to you
After 90 years your age will be 100 years.
After 90 years your sister's age will be 5+90 = 95 years
Correct option A
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