⟩ The average temperature of Monday to Wednesday was 37C and of Tuesday to Thursday was 34C. If the temperature on Thursday was 4/5th of that of Monday, the temperature on Thursday was?
37 - 3 = 34
( (mon + tue + wed) / 3 ) - 3 = (tue+wed+thu)/3
( mon + tue + wed -9) / 3 = (tue + wed+ thu) /3
( mon + tue + wed - 9) = (tue + wed + thu )
mon - 9 = thu
(since thu = (4/5) mon )
(5 * thu)/4 - 9 = Thu
Thu = 36