X, Y, W, and Z jointly purchased an office space for Rs 84 lakhs. The amount contributed by Y, W, and Z put together is three times that of X. The amount contributed by X, W, and Z put together is 320% of Y. The amount contributed by W is 20% of X, Y, and Z put together. What is the contribution of Z?
Explanation
To solve this, let x,y,w, and z represent the contributions (in lakhs) of X, Y, W, and Z, respectively.
Step 1: Set up the equations
Based on the provided information:
Total contribution: x+y+w+z=84
Condition 1: y+w+z=3x
Condition 2: x+w+z=3.2y (since 320% of y is 3.2y)
Condition 3: w=0.2(x+y+z)
Step 2: Solve for X and Y
From equations (1) and (2):
Substitute (y+w+z) with 3x in equation (1):
x+3x=84
4x=84
x=21
From equations (1) and (3):
Substitute (x+w+z) with 3.2y in equation (1):
3.2y+y=84
4.2y=84
y=4.284=20
Step 3: Solve for W
Using equation (4) and the fact that (x+y+z)=84−w:
w=0.2(84−w)
w=16.8−0.2w
1.2w=16.8
w=1.216.8=14
Step 4: Solve for Z
Using the total sum equation:
x+y+w+z=84
21+20+14+z=84
55+z=84
z=84−55
z=29
Correct Answer:
The contribution of Z is 29 lakhs, which corresponds to Option 3.