Find the lowest common multiple of 10, 14 and 20. Options
A) 360  B) 420  C) 510  D) 320  E) 140
LCM=2*2*5*7= 
<gadget id="calculator">2*2*5*7</gadget>
<output>140</output>
140.   Answer is 140
<result>E</result>
Find the lowest common multiple of 10, 14 and 20.