WORD PROBLEMS on Statistics 5 for Class 9 and 10
Question for practice
The following questions are more helpful for class tenth students for all boards.
The following questions are more helpful for class tenth students for all boards.
Questions 5. The average weight of A, B, C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, find the weight of B.
Submit your answer here in the comments or wait for answer
Questions 5. The average weight of A, B, C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, find the weight of B.
Submit your answer here in the comments or wait for answer
A+B+C/3=45
ReplyDeleteA+B+C=135-----eq.1
A+B/2=40
A+B=80-----eq.2
subs. value of (A+B) in eq.1
80+C=135
C=55----eq.3
B+C/2=43
B+C=86----eq.4
subs. value of C in eq.4
B+55=86
B=86-55
B=31
Therfore the weight of B is 31
good :)
Deletethnx sir..! :D
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Delete(A+B+C)/3=45
ReplyDeleteA+B+C=135-----[1]
(A+B)/2=40
A+B=80-----[2]
subtracting [2] from [1]
80+C=135
C=55----[3]
(B+C)/2=43
B+C=86----[4]
Putting C= 55 in eq.[4]
B+55=86
B = 31 kg
A+B+C/3=45
ReplyDeleteTHEREFORE, A+B+C=135(1)
A+B/2=40
THEN,A+B=80(2)
SUBTRACTING (2) FROM (1)
WE GET C=55
B+C/2=43
B+C=86(3)
PUTTING VALUE OF C IN(3)
WE GET B=31
THEREFORE,WEIGHT OF B=31 KG