@ThomasK48733610@_aqsa1 Look at the previous number, each time, it is obtained by multiplying the previous digit by the next digit plus 1.
6 × (6 + 1) = 6 × 7 = 42
8 × (8 + 1) = 8 × 9 = 72
Therefore, 9 × (9 + 1) = 9 × 10 = 90
The answer is 90.
@EricPyle17@AiWithliza Write this riddle as a simple equation, where x is the unknown
3X + 7 = 31
Subtract 7 from both sides of the equation.
3x = 24
Divide by 3.
24 ÷ 3 = 8
Let’s check: 3 × 8 + 7 = 24 + 7 = 31.
So the answer is 8.