If for every 7 carrots he sees at the store and 2 are rotten then:
7 carrots = 2 rotten carrots
14 carrots = 4 rotten carrots
21 carrots = 6 rotten carrots
Just multiply by 2!!
Hope this helps!!!!
Let n be the man's walking rate. Then:
9/n+9/27=3&1/3
243+9n=90n
243=81n
n=3
The man's walking rate was 3 mph
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