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Maths Puzzle
Numerical Ability
Show that for s (semiperimeter), r(radius of inscribed circle), and r 9radius of circumscribed circle), abc = 4srR.
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The driver of a car with a leaking radiator found it necessary to add water twice on a trip. The radiator held 120 liters and was filled with a 30% alcohol solution at the start. A
solve by addition
4x-y=3, 5x+4y=2
a)1,__)
b)-10/21,23/21
c)(__,2)
d) no solution