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(y+40) boys can do a piece of work in (z-20) days. Total work = (y+40)x(z-20) Eq.(i) (y-5) boys can do the same piece of work in (z+20) days. Total work = (y-5)x(z+20) Eq.(ii) If (y+30) boys can do the same piece of work in (z-12) days. Total work = (y+30)x(z-12) Eq.(iii) So Eq.(i) = Eq.(ii) (y+40)x(z-20) = (y-5)x(z+20) yz-20y+40z-800 = yz+20y-5z-100 -20y+40z-800 = 20y-5z-100 20y+20y-40z-5z+800-100 = 0 40y-45z+700 = 0 40y-45z = -700 8y-9z = -140 Eq.(1) So Eq.(i) = Eq.(iii) (y+40)x(z-20) = (y+30)x(z-12) yz-20y+40z-800 = yz-12y+30z-360 -20y+12y+40z-30z-800+360 = 0 -8y+10z-440 = 0 -8y+10z = 440 Eq.(2) Add Eq.(1) and Eq.(2). 8y-9z-8y+10z = -140+440 z = 300 Put the value of ‘z’ in Eq.(1). 8y-9x300 = -140 8y-2700 = -140 8y = 2700-140 8y = 2560 Value of ‘y’ = 320
What will come in the place of question mark?
2, 5, 11, 23, ?
Select the number that will replace the question mark (?) in the following series.
35, 38, 43, 50, 61, 74, ?
Select the related number from the given alternatives.
29 : 65 : : 43 : ?
Select the missing number from the given alternatives:
Find the missing number by analysing the pattern followed by the numbers in each row.
Find the missing number by analysing the pattern followed by the numbers in each row.
What number should replace the question mark?
Insert the correct missing number from the choices given below: