Question

7. A student scored 38 marks in Hindi, 15 marks in Maths and 20 marks in
Science.
If there are a total of 58 students and only 3 students passed in all
the three subjects , how many passed in exactly two subjects amoung the
three subjects?
​

Answer 1

Answer:

Let x=Total marks

Let y=Passing marks

38% of Total marks=Passing marks+18 (given)

(38/100)*x=y+18………(1)

27% of Total marks=y-37 (given)

(27/100)*x=y-37……….(2)

From equation 1&2

0.38x=y+18

0.27x=y-37

Solving.

X=500 & Y=172

another equation

Make 2 equations

Make 2 equationsLet total marks be x and passing marks be y

Make 2 equationsLet total marks be x and passing marks be yFor student who passed

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37Now subtract equation 1 from 2 and get the value of x..

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37Now subtract equation 1 from 2 and get the value of x..X = 500

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37Now subtract equation 1 from 2 and get the value of x..X = 500Y = 172

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37Now subtract equation 1 from 2 and get the value of x..X = 500Y = 172% of passing marks=Y/X * 100

Make 2 equationsLet total marks be x and passing marks be yFor student who passed38% of x = y+18For student who failed27% of x = y-37Now subtract equation 1 from 2 and get the value of x..X = 500Y = 172% of passing marks=Y/X * 100Answer 34.5%