Medium
Find the missing number in the grid: Row1: 3, 15, 4 | Row2: 7, 38, 5 | Row3: 3, ?, 5
Explanation
Explanation
The middle number equals (1st number x 3rd number) + 3. Row 1: 3x4+3=15, correct. Row 2: 7x5+3=38, correct. Row 3: 3x5+3=18, so the missing number is 18.
PRO TIP
Re-check your working by substituting the answer back into the original question.