Study the diagram given below and answer the questions based on it.
$$\triangle$$ represents persons who like Reading
$$\circ$$ represents persons who like Cycling
$$\Box$$ represents persons who like Trekking
How many persons like Reading?
How many persons like Trekking and Reading but not Cycling?
How many persons like Reading and cyclling but not trekking?
For the following questions answer them individually
(5004 -12) $$\div$$ 39 - 6 = ?
In what ratio must tea at Rs.62 per kg be mixed with tea at !72 per kg so that the mixture must be worth ?64.50 per kg.