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a) 5/a = 9/16 --> a = 5 x 16 / 9 = 80/9
b) 5/4 = 6,5 /b --> b = 4(6,5)/5 = 26/5
c) 5/6 = 6,5/c ---> c = 6(6,5)/5 = 39/5
9.
OP = [6(10)+4(18)] /(4 +6)
OP = (60+72)/(10)
OP= 132/10 = 13,2