[tex] \frac{1}{4}[/tex] of 2340
= [tex] \frac{1}{4}[/tex] × 2340
= 585 (this is the total number of seniors)
[tex] \frac{1}{6}[/tex] of 2340
= [tex] \frac{1}{6}[/tex] × 2340
= 390 (this is the total number of sophomores)
585 + 390 = 975 (this is the total of sophomores and seniors)
Therefore the number of freshmen & juniors must be
2340 - 975
= 1365
