Bob eats 6 apples in 2 days. how many days will it takes to eat a basket of apples containing 51 apples?

If he eat 6 apples in 2 days so we can say he eat 3 apple in 1 day so if we want to know in how many days he can eat 51 apple you can say 51 ÷ 3= 17 also we can say 1day / 3 apples = ? days / 51 apples ⇒ 51×1 / 3 = 17 so he can eat 51 apples in 17 days :
i hope this be helpful 
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51/6=8.5 8.5*2=17 It would take 17 days for Bob to eat a basket of apples containing 51 apples.

The answer would be c