Question

A survey conducted among 480 students of two colleges C and C2 regarding the type of
computers they use, resulted in the following data (table), with partial information. It is
known that the ratio of number of students of C, and that of C, is 9:7.
College Desktop Laptop Both None
- - 15
₂ T 120 - 30 -
Total
195 7040
How many students of college G have at least one system?
(1) 195
(2) 90
(3) 315
(4) 255​

Answer 1

Answer:

255 is the right answer