Posted by Nicole on .
In a project, Mr Tung's daily wage was $100 more than Mr Pang's. Although Mr Tung worked 3 days less than Mr Pang, both of them earned $3600. Find the number of days Mr Tung worked in the project.

Math. 
Graham,
Find x, the days Mr. Tung has worked.
Mr. Tung's daily wage is (3600/x).
Mr. Pang's daily wage is (3600/x)100.
Mr. Pang worked (x+3) days.
Therefore:
3600 = (3600/x 100)(x+3)
Multiply by x/100:
36x = (36x)(3+x)
Expand and rearrange into quadratic form. Then find the quadratic roots. At least one root will be the number of days Mr. Tung has worked.