A refrigerator uses 2 units of electricity in 90 minutes . How many units does it consume in 3 hours .
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A refrigerator uses 2 units of electricity in 90 minutes . How many units does it consume in 3 hours .
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Answer:
4 units
Step-by-step explanation:
3 hours means 180 minutes
90 minutes ---> 2 units
1 minute ---> 2/90 units = 1/45 units
180 minutes---> 1/45×180 units = 4 units
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