Number Puzzles - General Questions

Find the missing number. In each figure, the centre number is related to the four outer numbers in the same way. Figure 1: outer 5, 4, 5, 3 → centre 35 Figure 2: outer 4, 5, 3, 5 → centre ?

Find the missing number. In each figure, the centre number is related to the four outer numbers in the same way. Figure 1: outer 5, 2, 8, 9 → centre 82 Figure 2: outer 2, 8, 9, 5 → centre ?

If 7 ★ 4 means 7 × 4 + 7, what is 4 ★ 17?

The sum of three consecutive numbers is 75. What is the largest of them?

The sum of three consecutive numbers is 57. What is the largest of them?