If x, y, and z are positive integers, and 4x = 5y = 6z, then the least possible value of x + y + z is
Options
A) 15 B) 28 C) 37 D) 42 E) 60
Take LCM of 4,5 and 6 = 60   Now 4x = 60 =&gt; x =15   5y = 60 =&gt; y = 12   6z = 60 =&gt; z =10   115+12+10 = 37.   Option 37.
<result>C</result>
If x, y, and z are positive integers, and 4x = 5y = 6z, then the least possible value of x + y + z is