Find the number of solutions for 3x+4y=60, if x and y are positive integers	Choose the correct choice from the following:  A) 1  B) 2  C) 3  D) 4  E) 5
3x+4y=60   =&gt;x=(60-4y)/3   as x and y are positive integers, put y=1,2,3,... &amp; find x   y=3,x=16   y=6,x=12   y=9,x=8   y=12,x=4   (x,y)=(4,12),(8,9),(12,6),(16,3)   only 4 solution   ANSWER:4
<result>D</result>
Find the number of solutions for 3x+4y=60, if x and y are positive integers