A trader purchased three products - Product X, Product Y, and Product ...
We are given that the amount spent on buying Product X, Product Y, and Product Z is $500,000.
Say the amounts spent on buying Product X, Product Y, and Product Z are x,y, and z, respectively.
⇒ x + y + z = 500,000 (Equation 1)
We have to determine whether z>200,000.
Statement 1:
We are given that the sum the trader paid for Product X and Product Y combined was 3 times the sum the trader paid for Product X.
⇒ x + y = 3x
y = 2x (Equation 2)
Substituting equation (2) in equation (1):
⇒ x + 2x + z = 500,000
⇒ 3x + z = 500,000
We have an unknown x. So, we cannot determine whether z > 200,000. Insufficient!
Statement 2:
We are given that the trader paid more to purchase Product Z than to purchase Product Y.
⇒ z > y (Inequality 3)
With the help of equation (1): x + y + z = 500,000 and inequality (3): z > y, we cannot determine whether z > 200,000. Insufficient!
Statement 1 & 2 together:
Let's put down the two equations (1) and (2) and the inequality (3).
x + y + z = 500,000 (Equation 1)
y = 2x (Equation 2)
z > y (Inequality 3)
Since equation (3) has only z and y variables, let's eliminate variable x from equation (1) and (2).
From equation (2), we have x = y/2. By plugging in the value x in equation (1), we get:
y/2 + y + z = 500,000
y + 2y + 2z = 1,000,000
3y + 2z = 1,000,000 (Equation 4)
Substituting (5) in (3):
5z > 1,000,000
z > 200,000
So, the answer is 'Yes'. The two statements together are sufficient!
Alternate approach:
Alternate way of solving further after Equation (4): 3y + 2z = 1,000,000
Let's assume that y = z, and see what are their values. Say y = z = p
Thus, 3p+2p = 1,000,000
⇒5p = 1,000,000
⇒p = 200,000
Thus, y = z = 200,000;
However, this goes against the fact given in inequality (3): z > y.
Thus, y < 200,000 & z > 200,000. The answer is 'Yes'. Sufficient!