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 8, 6, 3, 9 → centre 75 Figure 2: outer 6, 3, 9, 8 → centre ?

A mother is 4 times as old as her son, who is 10. How old will the mother be in 8 years?

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 5 ★ 4 means 5 × 4 + 5, what is 4 ★ 21?

Find the missing number. In each figure, the centre number is related to the four outer numbers in the same way. Figure 1: outer 4, 2, 5, 5 → centre 33 Figure 2: outer 2, 5, 5, 4 → centre ?