By Analyzing ROW 1 and ROW 3 we can write equations as 3x+y=45 (from ROW 1)

x+3y=55(from ROW 3)

we get x=10 and y=15

Now from ROW 2 we can write x+y+2z=39 => 10+15+2z=39 => 2z=39-25 => 2z=14 =>z=7

HENCE THE VALUE OF BOTTOM ROW IS 7+7+10+7=31(ANSWER)

What is the value of the bottom row of the grid?

Jagrati is playing with building blocks. She decides to stack the blocks so that each row has one less than the row below. There are a total of 55 blocks and Jagrati wants just one block on top. How many blocks should she put on the bottom row?

What should be the value of the fourth column?