Question

5 6 35
4 20 84
3 (?) 30
( )=?

Answer 1

5x6 +5 = 35
4x20+4= 84

3x9+3 = 27+3=30

hence ?=9

Answer 2

your ans is 9
now explanation ok
let 5x=35
x=7
let x=n-1
x=7-1=6
now 4x=84
x=21
x=21-1=20
now see this
3x=30
x=10
x=10-1=9
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