Question 12Each shape stands for a number. The totals of the rows and columns are shown. What is the value of the second row?
Question 18In the grid, what is the difference between the sum of the two highest odd numbers and the product of the two lowest even numbers?
Question 19Follow the line from A through the boxes: A, Z, C, X, F, U, J, Q, O. Which letter comes next? (Use A=1, B=2, …, Z=26.)