Direction: what should come in place at question mark(?).

$$ {1\over 8}×(223+?)=71$$

Direction : What should come in place of the question (?) in the following question.

16  8    12   30  ?    472.5

If an 8-digit number 1862383A is divisible by 22, find the value of A.

A rectangular ground 16m long and 10m breadth. It has a gravel path 2.5m wide all around it on the outside. What is the area of the path?

A sum of Rs. 400 becomes Rs. 448 at simple interest in 2 years. In how many years, will the sum of Rs. 550 amounts to Rs. 682 at the same rate?

The radius of a circular field is equal to the side of a square field whose perimeter is 784 feet. What is the area o the circular field?

If 0.8 : X  :: 5 : 8 then X is equal to