Nan and sato are designing a coffee table would you sing 4 inches tile nan uses 30 tiles and sato uses half as many many total tiles did they use

The correct question in the attached figure

it is assumed that the tile is square
area of the square=b²
b is the length side of a square
b=4 in
area of the tile=4²----> 16 in²

Part 1)  How many total tiles did they use?
Nao uses 30 tiles
and 
Sato uses (1/2)*30=15
so
Nao and Sato uses----> 30+15----> 45 tiles

the answer Part 1) is
45 tiles

Part 2) If the area of the table is 36 inches by 26 inches, will they have enough tiles for the table?

find the area of the table
area of the table=36*26----> 936 in²

area of one tile=4*4----> 16 in²

if 1 tile------------------> 16 in²
x tiles-------------> 936 in²
x=936/16----> x=58.5 tiles

58.5 > 45
so
there are not enough tiles for the table

the answer part 2) is
there are not enough tiles for the table

Part 3)  If not, how many more will they need?

tiles required=58.5-45------> 13.5-----> 14 tiles

the answer part 3) is
14 tiles