A and B are two multiples of 14, and Q is the set of consecutive integers between A and B, inclusive. If Q contains 10 multiples of 14, how many multiples of 7 are there in Q?
Answers.
A) 20 B) 19 C) 18 D) 17 E) 16
Halfway between the multiples of 14, there will be another multiple of 7.   The total number of multiples of 7 is  10+9= 
<gadget id="calculator"> 10+9</gadget>
<output>19</output>
19.   The answer is 19.
<result>B</result>
A and B are two multiples of 14, and Q is the set of consecutive integers between A and B, inclusive. If Q contains 10 multiples of 14, how many multiples of 7 are there in Q?