lololol

There are 22 students in the class. There are as many boys as girls. One day, 10 students from the class had to go for speech day rehersal and there were twice as many boys as girls left. How many boys and how many girls went for the speech day rehersal?

Math teacher wrote this on the board and every bit of it is true. and since theres only half the class left, we can proceed wif normal lesson, and ya we got quite bored. and since we includes me, i decided to draw a model like a typical pri sch kid, lolz. it happens when you been doing stuff like lines on planes and planes on planes and point from line and point for plane and intersecting lines and planes and blah blah blah.......

anyway, tat got some of us quite interested in pri sch math agn, so of course we got the last yr psle math. who can forget this, must be some genius who set it, so hard yet so cheap: And er, the whole figure is a square(yes its dam off but its not drawn to scale anyway)

lolz, got a few people for half and hour or so, till they came up wif different methods. We have 3 so far.
1)Basic angles and triangles, though you have to be able to see the thing you need, and this is the cheap but hard part.
2)Trigo. lolol, some1 gave up and wacked arc tangent
3)Scaled diagram, typical after all the optics lessons

haha, math teacher took 30sec to do, i took 30 sec to rmb how i solved it last time, think i took dam long tat time.