66.
How many sides does a regular polygon have whose interior and exterior angle are in the ratio 2 : 1 ?

67.
Which of the following is the lowest ratio ?

68.
$$\frac{3}{4}$$ : $$\frac{1}{2}$$ :: 27y : ? Solve this -

69.
Harsha is 40 years old and Ritu is 60 years old. How many years ago was the ratio of their ages is 3 : 5 ?

70.
Two numbers are in the ratio $$1\frac{1}{2}$$ : $$2\frac{2}{3}$$ When each of these is increased by 15, they become in the ratio $$1\frac{2}{3}$$ : $$2\frac{1}{2}$$ . The greater of the numbers is = ?

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