The average of 6 numbers is 8.5 , when one number is discarded the average of the remaining numbers becomes 7.2 .what is the discarded number?

The average of 6 numbers is 8.5 , when one number is discarded the average of the remaining numbers becomes 7.2 .what is the discarded number? Correct Answer 15

The average of 6 numbers is 8.5 So, the sum of 6 numbers is 8.5x6 or 51 The average of 5 numbers is 7.2 So, the sum of 5 numbers is 7.2x5 or 36 So, the discarded number is 51 - 36 or 15 Normal 0 false false false EN - US X - NONE X - NONE /* Style Definitions */ table.MsoNormalTable {mso - style - name:"Table Normal"; mso - tstyle - rowband - size:0; mso - tstyle - colband - size:0; mso - style - noshow:yes; mso - style - priority:99; mso - style - parent:""; mso - padding - alt:0in 5.4pt 0in 5.4pt; mso - para - margin - top:0in; mso - para - margin - right:0in; mso - para - margin - bottom:10.0pt; mso - para - margin - left:0in; line - height:115%; mso - pagination:widow - orphan; font - size:14.0pt; mso - bidi - font - size:15.0pt; font - family:SutonnyMJ;}