if we divide 107 by 11, we end up with a quotient of 9 and a remainder of 8.
the new mixed fraction will have the quotient upfront followed by a fraction, and the denominator will still be the same 11, but the numerator will be the remainder, namely

D is the diameter of the wheel
the circle is π.d = 180
so d = 180/π = 57 cm
You have to subtract both sides by 64 and you will get,
-50 = 5z. Then divide both sides by 5, and you get -10 = z.
That means "is this the right amount of keys" and that ia what it means
It would be: 360- (101+133+76)
360-310 = 50 degree