Incorrectly 81920

Oliver calculated 12 tasks correctly, which was 8 more than the ones he calculated incorrectly.
A-HOW MANY PROBLEMS DID OLIVER WRONG?
B-how many tasks did he solve together?

Correct answer:

b =  4
n =  16

Step-by-step explanation:

a=12 a=8+b  b=a8=128=4
n=a+b=12+4=16



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