Answers

1) Triangle consist of 9 cubes.

2) a) Turn on 1st switch and wait for some time.
b) Turn off Switch 1 after 2-3 minutes and turn on switch 2.
c) Walk into the room with bulbs, the bulb connected to switch 2 is ON, bulb connected to switch 1 must be warm and last bulb is connected to switch 3.

3) Answer Is 48 Eggs. 1 hen lays 1 egg in 3 days means 1 hen will lay 4 eggs in 12 days and 12 hens will lay 48 eggs.

4) There are total 11 squares

5) Answer = 38
a) First row : 15+15+15=45
b) Second Row: 4+4+15 = 23
c) Third row: 4+3+3 = 10
d) Fourth row: 2+3+3*11 = 38