Explanation(III)-Calculation

Let's make the following assumptions:

Apples=X
Bananas=Y
Coconuts=Z

Hence,
3X=30, X=10
X+2Y=18, 10+2Y=18, Y=4
4-Z=2, Z=2

Therefore, X+Y+Z=10+4+2 =16

Explanation(II)- Calculation

Advertiser gets $0.1 per click. So, the advertiser gets a dollar for 10 clicks and 200 clicks for $20. But since only 20% of the visitors click an ad. Hence, the advertiser needs 1000 visitors to generate 200 clicks and $20.

Explanation(I)- Azaan

Q) How many times is Azaan called in a week?

The Azaan is called 36 times in a week. 5 times on each day except Friday when it's called 6 times. 1 extra time for Namaz-e-Jumma just before the beginning of the Arabic Khutba(Imam's address).