Water percent

A 15 g sample of the substance contains 70% water. After drying, the substance reduced its weight to 9 g. What percentage of water is now in the sample?

Correct answer:

p =  50 %

Step-by-step explanation:

m1=15 g q=70%=10070=0.7 m2=9 g  v=q m1=107 m1=0.7 15=221=10.5 g s=m1v=m1221=1510.5=29=4.5  p=100 m2m2s=100 m2m229=100 994.5=50%

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