OreoShake wrote:

ramkryp wrote:

Two containers of equal capacity are full of a mixture of oil and water . In the first, the ratio of oil to water is 4:7 and in the second it is 7:11. Now both the mixtures are mixed in a bigger container. What is the resulting ratio of oil to water.

a. 149 : 247

b. 247 : 149

c. 143 : 241

d. 241 : 143

Can this question be done through allegation? thanks

when i read: "Two containers of equal capacity"...

then:

first container 4:7 so capacity 4+7 = 11

second container 7:11 so capacity 7+11 = 18

to create an equal capacity that would be easier to work with:

11*18 = 198 in each container

looking at the results i need the capacity of the two containers, so:

198*2 = 396

answer a fits perfect:

a. 149 : 247 -- 149+247 = 396