The numbers of pizza slices that are sold in Joey's Pizza are only in quantities of 4 and 9 slices per customer. How many slices cannot be bought?  Select.
A) 58.  B) 50.  C) 67.  D) 74.  E) 22.
Answer:	Let X pizzas of 4 slices and Y pizzas of 9 slices.   4X + 9Y.   Lets check options wise.   A. 58 =&gt; 4(19) + 6(32)   B. 50 =&gt; we can't write anything with 4 and 6 series..Lets try 4(1) + 9(5) = 49 , 4(6) + 9(3) = 51 , nothing works out   C. 67 =&gt; 4(10) + 9(3)   D. 74 =&gt; 4(5) + 9(6)B. 74 =&gt; 4(5) + 9(6)   E. 22 =&gt; 4(1) + 9(2)   Answer: correct option is 50.
<result>B</result>
The numbers of pizza slices that are sold in Joey's Pizza are only in quantities of 4 and 9 slices per customer. How many slices cannot be bought?