If there are 9 rooms and each room has 5 windows then the total number of windows are .

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Solution

The correct option is D 45
Total number of rooms = 9
Number of windows in each room = 5

Total number of windows in 9 rooms = 9 × 5
= (4 + 5) × 5
= (4 × 5) + (5 × 5)
= 20 + 25
= 45

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