The triple beam balance shown above measures in grams what is the mass of the chick ?
a- 10 kg 7.5 g
b-175 g
c-17.5 g
d- 10.75 g

We have that

the first balance indicates> 10 g

the second balance indicates> 0 g

the third balance indicates> 7.5 g

therefore 
the mass of the chick is (10+0+7.5)> 17.5 g

the answer is
17.5 g

First you would find the difference 162-120=42
Then you would divide 42/120=.35
Then you move the decimal place over 2 to get a percent. 35%
Since the number is getting larger, it would be a 35% increase.
You can double check this by dividing 120 by 100 120/100=1.2
Then you would multiply it by 35 1.2×35=42
120+42=162
35% increase is the correct answer