The average weight of 3 men A, B, and C is 84 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The sum of weights of $A, B,$ and $C$ is $3 	imes 84 = 252 \, kg$.When $D$ joins,the total weight of $A, B, C,$ and $D$ is $4 	imes 80 = 320 \,

Vedclass · Accepted Answer

$75$

Vedclass · Answer

(D) The sum of weights of $A, B,$ and $C$ is $3 	imes 84 = 252 \, kg$.When $D$ joins,the total weight of $A, B, C,$ and $D$ is $4 	imes 80 = 320 \, kg$.Therefore,the weight of $D = 320 - 252 = 68 \, kg$.The weight of $E = D + 3 = 68 + 3 = 71 \, kg$.When $E$ replaces $A$,the new group is $B, C, D,$ and $E$. The sum of their weights is $4 	imes 79 = 316 \, kg$.So,$B + C + D + E = 316$.Substituting the values of $D$ and $E$: $B + C + 68 + 71 = 316$.$B + C + 139 = 316 \implies B + C = 316 - 139 = 177 \, kg$.Since $A + B + C = 252$,we have $A + 177 = 252$.Therefore,$A = 252 - 177 = 75 \, kg$.

Similar Questions

Average rainfall on Monday,Tuesday,Wednesday and Thursday is $420.5\, cm$ and average on Tuesday,Wednesday,Thursday and Friday is $440.5\, cm$. If the ratio of rainfall for Monday and Friday is $20:21$,find the rainfall in $cm$ on Monday and Friday.

$A$ library has an average of $510$ visitors on Sundays and $240$ on other days. The average number of visitors per day in a month of $30$ days beginning with a Sunday is:

Five years ago,the average age of $P$ and $Q$ was $15 \text{ years}$. Now,the average age of $P$,$Q$,and $R$ is $20 \text{ years}$. What will be the age of $R$ after $10 \text{ years}$?

If the mean of $a, b, c$ is $M$ and $ab + bc + ca = 0$,then the mean of $a^2, b^2, c^2$ is

The arithmetic mean of the scores of a group of students in a test was $52$. The brightest $20\%$ of them secured a mean score of $80$ and the dullest $25\%$ a mean score of $31$. The mean score of the remaining $55\%$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module