Question

Chalk contains calcium, carbon and
oxygen in the ratio 10:3:12. Find the
percentage of oxygen in chalk. *

Answer 1

Answer:

We have,

Calcium:Carbon:Oxygen=10:3:12

Then,

Total parts is =10+3+12=25

Now

oxygen%= oxygen /total ×100

               =  12/25×100

                =  12×4

                = 48%

Hence, this is the answer.