It should be clear that if 1lb is 6 apples, then 2lbs is 12 apples...
10lbs : $d
1lb : $d/10
2lb : $d/5 = d/5 x 100c = 20d c.
The answer should be A.
See if 1 pound is 6 apples.
2 pound is 12 apples.
Knowing that 10 pound equals to d.
To get 2 pounds, we need to divide d by 5= d/5.
After this, we know that d is in dollars not in cents.
So we multiply d/5 by 100.
We should get 20d.
Hm... let me try this:
10 lbs <=> 60 apples <=> $ d
(where <=> means equivalent. Since 1 lbs <=> 6 apples, 10 lbs <=> 60 apples)
You want 12 apples, so divide everywhere by 5 to get:
2 lbs <=> 12 apples <=> $ d/5
Then, just convert this into cents by multiplying by 100.
At this stage you should do this problem by the technique of picking numbers.
Let's choose a value for d, how about d=10, so that 10 pounds of apples is 10 dollars. Thus the apples cost 1 dollar per pound. So it's 1 dollar for 6 apples, and therefore 2 dollars for 12 apples. 2 dollars is equal to 200 cents. Put a nice big circle around the number 200. That's the answer you want to get.
Now, since we chose d=10, we substitute 10 in for d in each answer choice and use our calculator. We get the following:
(B) approximately 166.67
(D) approximately 16.67
Since (A) is the only answer that came out to 200, the answer is choice (A).
Important Remark: The answer is not (A) because (A) came out correct. The answer is (A) because the other 4 choices did not come out correct. You must try all 5 choices before selecting your answer.