Question

which rectangle represents 30 x 50? each square is 10 units wide and 10 units long.

Explanation:

Step1: Calculate the area of the target rectangle

$30\times50 = 1500$

Step2: Calculate the area of one square

Since each square is 10 units wide and 10 units long, the area of one square is $10\times10=100$

Step3: Find the number of squares in the target - rectangle

The number of squares needed to represent the rectangle of area 1500 with each square of area 100 is $\frac{1500}{100}=15$
We need to count the number of squares in each given rectangle. If we count the squares in the rectangles, we look for the one with 15 squares.

Answer:

(You need to count the squares in the two given rectangles in the actual picture and pick the one with 15 squares. Since the picture - related counting is not done here, the final choice depends on your visual inspection of the number of squares in the two rectangles in the provided image.)