Thank you so much!
This question is actually pretty easy! We want to set it up in this formula: a/b = c/d
For this problem:
42/49 = x/21
To find x (or the distance across the river), we need to divide 42 by 49 then multiply it by 21
That gives us x = 18 m
Okay, thanks for trying anyway!
Must be, thanks regardless!