There are 250 bricks used that to build wall that is 20 ft hifh? how many bricks will be used to build a wall that is 30 feet?

250÷20=12.5
12.5×30=375
It will take 375 bricks to build a thirty foot wall.

Well, basically, what you have to do is compare. So
250 bricks= 20 feet
    y bricks= 30 feet
   I represented the unknown with y, anyway, you have to cross and multiply. So 30 multiplies 250 and 20 multiplies y. So;
7500=20y
  Next, you have to divide the both sides by 20. That will be;
7500/20=20y/20
375=y
y=375
  So it takes 375 bricks to build upto 30 feet. Hope i helped.

Ask google i believe they can you with that question