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Question
A birthday party is arranged in third floor of a hotel. 120 people take 8 trips in a lift to go to the party hall. If 12 trips were made how many people would have attended the party?
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Solution
Let the number of people attended the party be x.
| Number of people | 120 | x |
| Number of tips | 8 | 12 |
As the number of trips increases, number of people also increases.
∴ They are in direct proportion.
`(x_1)/(y_1) = (x_2)/(y_2)`
`120/8 = x/12`
x = `(120 xx 12)/8`
= 180
180 people attend the party in 12 trips
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