SOLUTION: sandra is more than 20 years old and less than 60 years old. You can count by 7's to reach sandra's age. Next year you will be able to count by five's to reach Sandra's age. how ol

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Question 232390: sandra is more than 20 years old and less than 60 years old. You can count by 7's to reach sandra's age. Next year you will be able to count by five's to reach Sandra's age. how old is Sandra? Explain how you figure this out.. thakns!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
What are the years between 20 and 60 that are divisible by 7?
21%2F7+=+3
28%2F7+=+4
35%2F7+=+5
42%2F7+=+6
49%2F7+=+7
56%2F7+=+8
The next one 63%2F7+=+9 puts me over 60
Now add 1 to all these ages
21+%2B+1+=+22
28+%2B+1+=+29
35+%2B+1+=+36
42+%2B+1+=+43
49+%2B+1+=+50
56+%2B+1+=+57
Which age can you reach by counting by 5's?
%2849+%2B+1%29%2F5+=+10
So, Sandra must be 49 now