A machine can finish a work in 18days and 2nd machine can finish the work in 15days. 2nd machine worked for 10days and left the job. In how many days, 1st machine can finish the remaining work?	Pick.
A) 4days
B) 6days
C) 8days
D) 10days
E) 5days
2nd machine 10days work = 1/15*10 = 2/3   Remaining work = 1 - 2/3 = 1/3   now 1/18 work is done by 1st machine in 1day   1/3 work is done by 1 machine in 18*1/3= 
<gadget id="calculator">18*1/3</gadget>
<output>6</output>
6days.   Answer is 6days
<result>B</result>
A machine can finish a work in 18days and 2nd machine can finish the work in 15days. 2nd machine worked for 10days and left the job. In how many days, 1st machine can finish the remaining work?