Final answer:
After starting with 4 kg of rice and using 1/2 kg of it, a student would have 7/2 kg, or 3.5 kg, of rice left. This is done by converting 4 kg to halves and then subtracting 1/2 kg.
The correct option is c.
Step-by-step explanation:
If a student starts with 4 kg of rice and uses 1/2 kg of it, the calculation to determine how much is left is a simple subtraction: 4 kg – 1/2 kg.
To do this, it may be easier to convert 4 kg into fractions with the same denominator before subtracting. In this case, since we are dealing with halves, we should convert 4 kg into halves as well. There are 8 halves in 4 kg because 4 divided by 1/2 equals 8.
- Convert 4 kg to halves: 4 kg = 8/2 kg (since 4 divided by 1/2 is 8).
- Subtract the rice used from the total: 8/2 kg - 1/2 kg = 7/2 kg.
The remaining amount of rice, therefore, is 7/2 kg, which is 3.5 kg when expressed as a decimal.
The correct answer is c) 7/2 Kg.