The largest flag that Jake can draw on the 25 cm by 20 cm sheet of paper while maintaining the 3 to 2 ratio is 30 cm long and 20 cm wide.
How to get the largest flag
Given:
Length to width ratio of the flag = 3 to 2
Dimensions of the paper = 25 cm by 20 cm
Using the ratio (x:y = 3:2):

Given the maximum length of the paper is 25 cm:

Now, calculate the width using the scaling factor:

However, the width cannot exceed the width of the paper (20 cm). Therefore, the largest width within the paper's constraints is 20 cm.
Using the ratio, when the width of the flag is 20 cm:

Therefore, the largest flag that Jake can draw on the 25 cm by 20 cm sheet of paper while maintaining the 3 to 2 ratio is 30 cm long and 20 cm wide.