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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?
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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