Two equations: A+B=3800 and A-B=478. Thus, A=478+B. then, replacing A in the first equation, 478+2B=3800. From this, B=1661. Then, A=2139.
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You see that there is a difference of 400 between the two numbers. Therefore, just take 400 divided by 2. This equals 200 and if you add 200 to 3600, it adds up to 3800.Another way to do this is simply find the average of the two numbers. Add 3600 and 4000 which equals 7600. Now Take 7600 divided by 2. This makes the averege of the two numbers which is 3800.
subtract
Oh, dude, total means to add up all the numbers. It's like when you're at a restaurant and the bill comes, you total up all the food and drinks you ordered to figure out how much you owe. So, yeah, total is all about adding, not subtracting.
You would usually associate total with add. However getting a total can sometimes involve having to subtract something.
add 2% to the total