How many multiples of 7 are there between 21 and 343, inclusive ? Choose the most appropriate option
A) 48
B) 47
C) 46
D) 45
E) 44
7 * 3= 
<gadget id="calculator">7 * 3</gadget>
<output>21</output>
21   7 * 49= 
<gadget id="calculator">7 * 49</gadget>
<output>343</output>
343   Total multiples= (49-3) + 1= 
<gadget id="calculator">(49-3) + 1</gadget>
<output>47</output>
47   Include 21 and 343= 47   Answer is 47
<result>B</result>
How many multiples of 7 are there between 21 and 343, inclusive ?