4) There are 4 weighing scale kept on the table.

1st weighing scale has 1 cube & 1 ball kept on it & weighs 13gm.

2nd weighing scale has 2 ball & 1 cube kept on it weighing 18gm.

3rd weighing scale has 2 prism & 1 ball weighing 23gm.

How much the 4th weighing scale will measure if 1 ball, 1 prism & 1 cube is kept on it?

Solution:

cube:x

ball:y

prism:z

So

x+y=13

2y+x=18

2z+y=23

So

x=8

y=5

z=9

So

y+z+x=8+5+9=22

So 1 ball, 1 prism & 1 cube weighs 22 gm