chocolate bars are sold in packages of 4 or 9 only. if mark bought 97 chocolate bars exactly, what could be the number of large packs mark bought?	Choose the correct choice from the following options
A) 3
B) 4
C) 8
D) 9
E) 13
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">97 - 16</gadget>
<output>81</output>

<gadget id="calculator">81 / 9</gadget>
<output>9</output>

<result>D</result>
chocolate bars are sold in packages of 4 or 9 only. if mark bought 97 chocolate bars exactly, what could be the number of large packs mark bought?
divide(subtract(97, multiply(4, 4)), 9)
let number of packs of four = f let number of packs of nine = n 4 f + 9 n = 97 now , we need to test for values of n . since sum 97 is odd and 4 f will always be even , n ca n ' t be even . now , we can test for values e = 2 , 4 and 6 4 * 4 + 9 * 9 = 16 + 81 = 97 answer d