The numbers of pizza slices that are sold in Joey's Pizza are only in quantities of 3 and 5 slices per customer. How many slices cannot be bought?	Pick
A) 19.	B) 38.	C) 33.	D) 22.	E) 21.
Let X pizzas of 3 slices and Y pizzas of 5 slices.   3X + 5Y.   Lets check options wise.   A. 19 =&gt; 3(3) + 5(2)   B. 38 =&gt; 3(6) + 5(4)   C. 33 =&gt; 3(1) + 5(6)   D. 22 =&gt; 3(4) + 4(2)   E. 21 = we can't write anything with 3 and 5 series..Lets try 3(5) + 5(1) = 20 , 3(4) + 4(2) = 22 , nothing works out.   Answer: correct option is 21.
<result>E</result>
The numbers of pizza slices that are sold in Joey's Pizza are only in quantities of 3 and 5 slices per customer. How many slices cannot be bought?