Solution:

47 + 53 + 59 + 61 = 220

Solution:

SIX - 9 (IX) = S
9 (IX) - 10 (X) = I
40 (XL) - 50 (L) = X

=> SIX

Solution:

303 , 303 , 303 , 303 , 303

Solution:

pi * z * z * a

Solution:

1,2, & 3

1 x 2 x 3 = 6 and 1 + 2 + 3 = 6

Solution:

The nail would be at the same height since trees grow at their tops.

Solution:

20 times

8,18,28,38,48,58,68,78,98,80,81,82,83,84,85,86,87,88,88(2),89

Solution:

143547

Solution:

18 x 12 ÷ 2 + 3 = 111

Solution:

110 kms

72927+110 = 73037 , a palindrome

Solution:

99+9/9 = 100

Solution:

100. Looks hard? Don't worry, just work it backwards and you'll find it very easy.

Solution:

44 and 66

Solution:

Just 1

Solution:

Both would be the same distance from City owlna. (since they are at a same point)