Mixtures Proportions Ratio GMAT QUANT

GMAT QUANT Data Sufficiency Mixtures level 700 plus
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.

GMAT QUANT Data Sufficiency Mixtures level 600 700
A dishonest milkman professes to sell his milk at cost price but he mixes it with water. Find the percentage of water in the mixture.
(1) By adding water, the milkman gains 25%.
(2) Milk in the new mixture is 80%.

GMAT QUANT Data Sufficiency Level 600 700, Mixtures
There are three varieties of sugar in a store. Sugar (S1) costs $6 per kilogram and sugar (S2) costs $9 per kilogram. Sugar (S1) is mixed with Sugar (S2) and a new variety of Sugar (S3) is formed. If 20 kilograms of Sugar (S3) consists of A kilogram of Sugar (S1) and B kilogram of Sugar (S2), is A > B ?
(1) A > 9
(2) The cost of 20 kilogram of Sugar (S3) is more than $150.

GMAT QUANT Data Sufficiency Mixtures proportions ratios level 600 700
A bag contains a mixture of beans and pulses. To achieve 20 percent beans in the mixture, what percent of the mixture should be taken out and replaced with pulses?
(1) The mixture originally has 40 percent beans and 60 percent pulses.
(2) Total quantity of the mixture is 20 lb.