Number Puzzles - General Questions

Which number replaces the question mark? 36 49 ? 81

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 9, 9, 8, 8 → centre 145 Figure 2: outer 9, 8, 8, 9 → 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 7, 4, 8, 4 → centre 60 Figure 2: outer 4, 8, 4, 7 → centre ?

A mother is 4 times as old as her son, who is 11. How old will the mother be in 8 years?