Question

Chalk contains 40%calcium,12%carbon and rest oxygen.What is the amount of oxygen in 8 kg of chalk?Solve it

Answer 1

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Answer 2

calcium = 40%

carbon =12%

oxygen =100%-(40%+12%)

=100%-52%

= 48%

Oxygen in 8 kg chalk =48% of 8000g = 48×80-00-(means cut )

_________

1-00-(means cut )

=48 ×80

=3840 g

=3840g÷1000

=3.840kg /3 kg 840 g