Question

The expense of a lunch are partly constant and partly proportional to the number of guests .The expenses amount t rs.750 for 7 guest and rs.970 for 11 guests, then find the expense for 17 guests.
a)1450 b)1550 c)1650 d)1750

Answer 1

$\mathfrak{\huge{\underline{\underline{AnswEr :}}}}$

Let lunch expense of each guest =x

Let constant expense of lunch is =y

» we get

y + 7x = 750

y + 11x = 970

__________

-4x = -220

x = 55

And,

y + 7x = 750

y = 750 - 385

y = 365

For 17 guests

= y + 17x

= 365 + 17×55

= 365 + 935

= Rs. 1300

Answer 2

Step-by-step explanation:

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