Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

You need to arrange three 7 and mathematical symbols to form number 1?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?