Without knowing the area, there is no way to answer.
how many bags of cement for a pad 4x7x4 inches thick
The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags!
7 bags cement
4.4 bags
20
1
The answer will depend on how large and area you want the topping for. Without that information, no sensible answer is possible.
11 bags
560 bags
You will need 5.5 40kg bags for this floor. This allows for a typical waste factor of 5%
How many cement bags needed to mix 0.35 or 0.45 WC for one meter cube cement grout?
That depends on the size of your bags! My bags are 25 kg (20 l) 5 inches is 120 mm I would use 2 bags of cement and 4 bags of sand and 6 bags of gravel (well I do not buy my gravel in bags but the equivalent volume). I would mix with as little water as necessary to get a pourable consistency.