Posted by Jenny on Saturday, July 5, 2008 at 7:19pm.
Let the heights be L, P and A.
L + P + A = 418.5
L = (9/10) P (or P = 10/9 L)
L = (3/4) A (or A = 4/3
You now have three equations in three unknowns.
You can use the method of substitution to turn them into one equation in one unknown.
L (1 + 10/9 + 4/3) = (31/9)L = 418.5
L = 121.5 cm
P = 135 cm
A = 162 cm
A - P = 27 cm
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