Tennessee Science Grade 7

Chapter 3: Cell Processes

Solve an Equation

1
Water is a vital part of animals and humans. About 69% of a lactating cow's body consists of water. If an adult lactating cow weighs 180 kg, how many kilograms of water does its body contain?
A)125 kg
B)116.2 kg
C)117.2 kg
D)124.2 kg
2
Water is a vital part of animals and humans. About 64.7% of a dry cow's body consists of water. If an adult dry cow weighs 180 kg, how many kilograms of water does its body contain?
A)116.5 kg
B)125.2 kg
C)120 kg
D)113.2 kg
3
Watermelon is 92 percent water, the highest percent by weight of any fruit. How many kilograms of water does a 3.6 kg watermelon contain?
A)2.2 kg
B)3.3 kg
C)1.8 kg
D)0.3 kg
4
The human brain is composed of 70% water. How many kilograms of water does a 4.5 kg brain contain?
A)2.2 kg
B)4.1 kg
C)3.2 kg
D)0.9 kg
5
Human blood is composed of red blood cells, white blood cells, platelets, plasma, and water. How many kilograms of water does a 1 kg blood sample contain?
A)0.99 kg
B)0.25 kg
C)0.11 kg
D)0.82 kg
6
Human lungs are nearly 90 percent water. How many kilograms of water does a 0.9 kg set of lungs contain?
A)0.8 kg
B)0.4 kg
C)0.5 kg
D)0.6 kg
7
If 62% of a goat's body consists of water, how many kilograms of water does a 65 kg goat body contain?
A)45 kg
B)42 kg
C)40.3 kg
D)38.8 kg
8
If 62% of a dog's body consists of water, how many kilograms of water does a 31kg dog body contain?
A)19.9 kg
B)19.2 kg
C)18.3 kg
D)17 kg
9
If 62% of a deer's body consists of water, how many kilograms of water does a 95 kg deer body contain?
A)58.9 kg
B)33.0 kg
C)58.9 kg
D)60 kg
10
A sample of gypsum on Mars was found to contain 20.9% water by weight. If the sample is 20 kg, how many kilograms of water does the sample contain?
A)6 kg
B)2.2 kg
C)5.5 kg
D)4.2 kg
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