Question

ex. 13 repede plzz !!!!!

Answer 1

5n+245=845              n:3x8=616

5n=845-245               n:3=616:8

5n=600                      n:3=77

n=120                        n=77x3=231

54:n+67x5=344             894-n:4=833

54:n=344-335                894-833=n:4

54:n=9                           61=n:4

n=6                                n=61x4=244

Answer 2

5n+245=845-245
5n=600/5
n=120

54/n+67*5=344
54/n+335=344-335
54/n=9*54
n=486

n/3*8=616/8
n/3=77*3
n=231

894-n/4=833
n/4=894-833
n/4=61*4
n=244.