alltimeacheiver wrote:
Material A costs $3 per kilogram, and Material B costs $5 per kilogram. If 10 kilograms of Material K consists of x kilograms of Material A and y kilograms of Material B, is x > y ?
(1) y > 4
(2) The cost of the 10 kilograms of Material K is less than $40.
C trap...
we have two equations... given (2):
From the stem, X+Y=10
From (2) we have 3X+5Y<40
Let’s try a base case where X=Y=5
We would have,
3(5)+5(5)<40.... NO...
Because of that, Y needs to be less than X
——- Y<X
Now, ALWAYS have in mind the question,
Q: X>Y....
You have a DEFINITIVE yes, hence SUFFICIENT.