3 new ships. PP, CP, & MP. CP hs 39 more staterooms than the PP. The MP has 40 fewer staterooms than 4 times the number on the PP. Total number of staterooms on all 3 ships is 719. What is the number of rooms per ship?

Question

anonymous · Answer

CP=PP+39.  MP=4PP-40.  MP+PP+CP=719

Substitue equations 1 adn 2 into the third to get:
(4PP-40)+PP+(PP+39)=719
So 6PP-1=719
So 6PP=720
So PP has 120.
Then CP has 159 (39 more)
 and MP has 420 (to make 719)

radar · Answer

Please excuse the double post.  MP is 440 arithmetic error.