Question

The average weight of four people increases by 2kg when one person weighing 55kg is replaced by another person weighing x kg. What is the value of x?
(a) 57
(b) 59
(c) 61
(d) 63

Answer 1

Answer:

61

Step-by-step explanation:

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Answer 2

Answer:

63

Step-by-step explanation:

let,

(A+B+C+55)/4=Y/4

(A+B+C)=Y-55 .................(Eq 1)

now if 55 is replaced by X

then,

(A+B+C+X)/4=Y/4+2......................(Eq 2)

putting the value of (Eq 1)in (Eq 2)

[(Y-55)+X]/4=Y/4+2

=> (Y-55)+X=Y+8

X=55+8=63. ANSWEWR