Question

A television set uses three units of electricity in two hours. How many units will it use in seven hours? Give your answer to the nearest unit

Answer 1

Step-by-step explanation:

In 2 hrs= 3 units

So in 7 hrs = 7 * 3/2

= 21/2

= 10.5 units of electricity

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Answer 2

Answer:

10.5 units

10.5 kWh {since 1 kWh = 1 unit}

Step-by-step explanation:

Given,

Amount of energy used by television set in 2 hours = 3 kWh

By using unitary method, we get,

Amount of energy used by television set in 1 hour = 3/2 kWh = 1.5 kWh

Now,

Energy used by television set in 7 hours = (1.5×7) kWh = 10.5 kWh

Hence, energy used by television set in 7 hours = 10.5 kWh = 10.5 units