Bricks are sold in packages of eight or thirteen only. If Timmy, a builder, bought 144 bricks exactly, what could be the number of large packs Timmy bought?
Choose the correct answer.
A) 12
B) 5
C) 6
D) 8
E) 7
Let number of packs of eight = e   let number of packs of thirteen = t   8e + 13t = 144   Now , we need to test for values of t .   Since sum 144 is even and 8s will always be even , t can't be odd .   Now , we can test for values e = 12 , 8 and 6   8*5 + 13*8 = 40 + 104= 
<gadget id="calculator">40 + 104</gadget>
<output>144</output>
144   Answer 8
<result>D</result>
Bricks are sold in packages of eight or thirteen only. If Timmy, a builder, bought 144 bricks exactly, what could be the number of large packs Timmy bought?