Hard
Complete the number grid by finding the missing value: Row1: 19, 3, 25 | Row2: 17, 11, 39 | Row3: 9, 5, ?
Explanation
Explanation
In each row, the third number equals the first number plus twice the second number: 19+2x3=25 (matches row1), 17+2x11=39 (matches row2). Applying this to row 3: 9+2x5=9+10=19. The missing value is 19.
PRO TIP
Re-check your working by substituting the answer back into the original question.