Number Puzzles - General Questions

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

The sum of three consecutive numbers is 111. What is the largest of them?

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 ?

Find the missing number. In each figure, the centre number is related to the four outer numbers in the same way. Figure 1: outer 2, 8, 9, 6 → centre 70 Figure 2: outer 8, 9, 6, 2 → centre ?

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