Question

Pls solve it i will mark the best

Answer 1

1) the ratio of the two numbers is 3:4
expressing them as x we get,
3x+4x= 63
7x=63
then x= 9
so 3x= 27 and 4x= 36.

2)the original length is 30cm.
and the ratio of the original length is 5x cm.
solving for the value of x we get x= 6 cm.
so 3x= 3*6= 18 cm.
the reduced length is 18 cm.

3)let maria's money be represented as 5x then 
solving for x we get 30
then Ron money is rs 60
and Sam money is rs 180
the sum of the money of Ron and Sam is 180+60 which is rs 240

Answer 2

5) let no of boys = 4x
    let no of girls =3x
    no of girls = 18
              3x = 18
                x =  6
     no of boys = 24
     total no of students = 42

7)  savings:expenditure
      36000:288000
               1:8
8) let no of books with green cover = 2x
    let no of books with brown cover = 3x
     no of books with green cover = 18
                                                2x = 18
                                                  x = 9
     no of books with brown cover = 3x = 27
9) no of milk teeth:no of permanent teeth
                        20:32
                          5:8

10) x1=3m y1=4m
       x2=x  y2=24 m
            x2=24 * 3/4
            x2=18
 
11) no of large rooms = 3x
      no of small rooms = 4x
       no of small rooms = 20
                              4x = 20
                                x = 5
        no of large rooms = 3x=15