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There were 35 students in a hostel. If the number of students is increased by 7 the expenditure on food increases by 42 per day while the average expenditure of students is reduced by 1. What was the initial expenditure on food per day ?
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- 400
- 432
- 442
- 420
- 400
Correct Option: D
Suppose the initial expenditure per day = y
| ⇒ | - | = 1 | ||
| 35 | 42 |
| ⇒ | = 1 | |
| 210 |
⇒ y = 210 + 210 = 420
