P, Q and R have $9000 among themselves. R has two-thirds of the total amount with P and Q. Find the amount with R?	Choices:
A) 2400  B) 3600  C) 3998  D) 2539  E) 1930

Rationale: "b 3600 let the amount with r be $ r r = 2 / 3 ( total amount with p and q ) r = 2 / 3 ( 9000 - r ) = > 3 r = 18000 - 2 r = > 5 r = 18000 = > r = 3600 ."
Answer: B