Water makes about 3/4 of a person's weight.

1. If a student weighs 86 lbs., how much of his weight is water?

2. If a student weighs 70 lbs., how much of his weigh is water?

3. If water makes 30 lbs. of a student's weigh, how much does this student weigh?

4. If water makes 45 lbs. of a student's weigh, how much does this student weigh?

5. If water makes 60 lbs. of a student's weigh, how much does this student weigh?

1. 64.5 lbs

2. 52.5 lbs

3. 40lbs

4. 60 lbs

5. 80 lbs

Step-by-step explanation:

To determine how much of a persons weight is water, multiply 3/4 by their weight.

1. weight of water = weight * 3/4

= 86 * 3/4

= 64.5 lbs

2. weight of water = weight * 3/4

= 70 * 3/4

= 52.5 lbs

3. weight of water = weight * 3/4

30 = weight * 3/4

Multiply by 4/3 on each side

30*4/3 = weight * 3/4*4/3

40 = weight

4. weight of water = weight * 3/4

45 = weight * 3/4

Multiply by 4/3 on each side

45*4/3 = weight * 3/4*4/3

60 = weight

5. weight of water = weight * 3/4

60 = weight * 3/4

Multiply by 4/3 on each side

60*4/3 = weight * 3/4*4/3

80 = weight