Solution
p : q = 5 : 6 Eq.(i)
q : r = 2 : 5
multiply 3 in the above equation.
q : r = $$2\times3 : 5\times3$$ = 6 : 15 Eq.(ii)
So by Eq.(i) and Eq.(ii), p : q : r = 5 : 6 : 15
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