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Meera has a housewarming party at her pl...

Meera has a housewarming party at her place. She knows that around 40 guests will turn up for the party. Calcualte the pieces of sweets she has to order so that the guests take home 4 pieces each. Also, she has 90 lamps available with her, and she wants to use them all by placing them equally on the 20 stairs leading to her house, how many more lamps does she need to buy?

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The correct Answer is:
160; 10
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