A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days In how many days
can A alone finish the work
Answers
Answer:A and B do a work in 1/12
B alone can do work in 1/30
=1/12-1/30
=5-2/60
=3/60
A alone do a work in20 days
Step-by-step explanation:
Answer:
let the work done by A be x let the work done by B be Y.
Step-by-step explanation:
therefore , according to 1st condition. x+y=12 (in that both are doing work together) therefore according to 2nd condition. -x- y=30 (in that b do alone without A there a-b). adding equation 1and 2. x+y=12. x-y=30. 2x=42. . x=21
substituting value of x =21 in eq x+y=12
21+y=12y=12-21
y=-8
A do work in 21 days
B do in 8 days