16. Number of black marbles = 25 ´ 400


                                                 100
                                        = = ´ 400 = 100

Ans : 100

17. Part of full capacity used by servant
           = =

    Ans : 4/15

18. 18y⁰ + 10y⁰ + 8y⁰    =   180                     (The sum of angles of a D)

36y⁰    =    180
               y⁰    =   
                y⁰   =    5

           Ð Z    =    50

Ans : 50

19. Number of chairs produced per day = = 8

    If he works 4 days a week, number of chairs made = = 12

    Additional chairs    =    12 - 8    =    4

    Ans : 4

20. 
    
    Area of border

= 48 ´ 20 - 46 ´ 18
= 960 - 828
= 132


Ans : 132

21. If MN // LK,


D NSM ~ D KSL
If D s are similar, their sides are proportional.

                   = 204

Ans : 204

22. Maximum percentage of flowers




                    = 45 ´

                     = 75

Ans : 75

23.    3a - b          =    15

    
       3 ( -3) - b    =   15       
       -9 - 15         =    b
                b         =   -24

     

     

    Ans : 24

24. If a man does a job in 6 hours,

The laborer will do it in 48 hours.
In one hour the laborer does th of the work.
\ Four laborers will do 4 ´ = work.

If the laborers work together they will finish the work in 12 hours.

Ans : 12

25. Least number of washing machines = 22 ´ 5

                                                      = 110

Ans : 110

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