Solution:

25%

Suppose every item is priced at $100. On 20% discount, the price will become $80. Now he must add $20 to each item for original price which is 25% of $80.

Solution:

t1 + t2 = 100 minutes = 100/60 hours
t1 = x/55
t2 = (x+20)/40

x/55 + (x+20)/40 = 100/60
x = 1540/57

Total distance = x + (x+20) = 4220/57 miles = 74 2/57 miles

Solution:

Donkey

Solution:

The letter 'N'

Solution:

What

Solution:

See o double you

Solution:

Just In case

Solution:

41 years.

If the current age of Dakota is x
4(x+4) + 4(x+5) = 10x
Thus x=41 years

Solution:

Birbal drew another line that was larger than the pre-drawn line. Now the pre drawn line was smaller.

Solution:

Anastasia had dipped sugar in her tea already.