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Question
Reena noted the electricity meter readings of her house.
Last month’s reading was 118 units. This month’s reading is 193 units. How much electricity did she use in one month?
Solution
This month’s reading = 193 Last month’s reading =118
| 100 | 10 | 1 |
| 1 | 9 | 3 |
| - 1 | 1 | 8 |
| 7 | 5 |
So, she used 75 units of electricity in one month.
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