30

8: 112 pairs of shoes = 224 shoes.
224 ÷ 28 = 8.

Two possible answers:

1) 4(2 + 2) = 16
2) 8 ÷ 8 = 1

20

4100

there is 10 fish now cause the owner never pick up the 2 dead fish from the tank , the fishes cant swim away and drown

30
1 + 1 + 1 + 1 + 11 + 1 + 1 + 1 + 11 + 1 x 0 + 1 = 30

4 - 28 + 3 = -21

Yes,
-> 1 + 1 + 5 + 13 = 20
-> 11 + 3 + 3 + 3 = 20

14 years.

Let the son's present age be x years. Then, (38 - x) = x

2x = 38.

x = 19.

Son's age 5 years back (19 - 5) = 14 years.

1 brick = 1 kg + 1/2 brick
And so 1 brick is 2 kg heavy.

18 ÷ 2 x 9 + 24 - 5 = 100