Question

chalk contains 10% calcium, 3% carbon 12 % oxygen and the remaining sand find the amount of carbon and calcium ( in gram) in 2 1/2 kg of chalk .also find the amount of sand ( in kg )​

Answer 1

Answer:

In chalk,

Calcium=10%

Carbon=3%

Oxygen=12%

Remaining=100−(10+3+12)=100−25=75%·

Sand=75%

Weight of chalk =2 1/2 = 5/2 kg

Amount of carbon = 5/2 x 3/100 = 3/40kg

=3/40 × 1000=75grams

Amount of calcium = 5/2 x 10/100 = 1/4Kg

=250grams

and amount of sand = 5/2 x 75/100 =15/8 Kg

​

=15/8 =1.875kg