Question

Each of the five balls, Red, Blue, Yellow, Black and Green is of a different weight. It is known that: (i) Black ball is heavier than the Red and Blue balls. (ii) Yellow ball is lighter than the Red ball. (iii) Blue ball is heavier than the Red and Green balls.

Which ball could be the lightest one?

Accepted Answer

B. From (i): Black > Red, Blue. From (ii): Red > Yellow. From (iii): Blue > Red, Green. Combining inequalities: Black is heaviest. Blue > Red > Yellow, and Blue > Green. Since no relationship between Green and Yellow is given except that both are lighter than Blue/Red, either Green or Yellow could be the lightest.

Weight Comparison of Balls

Explanation

Practise this under exam conditions