Question

100 students contributed for a party. some contributed 15 rupees and the other contributed 25 rupees each. if total amount collected was 2100 rupees, how many contributed 15 rupees each
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Answer 1

Answer:

Step-by-step explanation:

X be the boys who give RS 15

Y be the boys who give RS 25

From first condition,

15x + 25y = 2100........(1)

From second condition,

X+ Y = 100.........(2)

Multiplying eqn 2 by 15

15X +15Y = 1500......(3)

Subtracting eqn 1 from 3

15X + 25Y= 2100

-

15X + 15Y = 1500

.,............,.............,..

10Y= 600

Y= 60

And

Put Y = 60 in eqn 2

X + 60 = 100

X = 40

Therefore,

40 students contribute RS 15

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Answer 2

Step-by-step explanation:

Brainly.in

What is your question?

Chirag5197

05.02.2019

Math

Secondary School

+5 pts

Answered

100 students contributed for a party. Some contributed Rs15 each &the others rs25 each. If total amount collected was rs2100, how many contributed rs15?

Step-by-step explanation:

X be the boys who give RS 15

Y be the boys who give RS 25

From first condition,

15x + 25y = 2100........(1)

From second condition,

X+ Y = 100.........(2)

Multiplying eqn 2 by 15

15X +15Y = 1500......(3)

Subtracting eqn 1 from 3

15X + 25Y= 2100

-

15X + 15Y = 1500

.,............,.............,..

10Y= 600

Y= 60

And

Put Y = 60 in eqn 2

X + 60 = 100

X = 40

Therefore,

40 students contribute RS 15