1)

56+67×?89+135+34×313=279


A) 7/6

B) 6/7

C) 1

D) None of this

Answer:

Option B

Explanation:

56+67×x89+85+34×103=259
Then
56×76×x89×58+34×103=259
3536x59+52
3536x=259+5952
3536x=56
x=(56×3645)
=67