Question

3. Paul and Lisa can do a piece of work in 40 and 60 days respectively. They began the work together, but Paul left after some days and Lisa finished the remaining work in 30 days. After how many days did Paul leave? ps: A. O 16 days B 12 days C 14 days D 10 days​

Answer 1

Answer:

(x+3)2

=(x+3)(x+3)

=(x)(x)+(x)(3)+(3)(x)+(3)(3)

=x2+3x+3x+9

=x2+6x+9