Answer:
218
Step-by-step explanation:
this is ratio.
5+4=9. which is the ratio you add it.
5/9×360=200
therefore the number of boys in school during 2013 january is 200 plus admitted boys in February is 200+18=218.
therefore the number of boys in school from january to february is 218.
17.5
You have to find n right?
9+4n-79 = 0
-> 4n = 70
-> n = 17.5
4.) ET is perpendicular to plane BAT