SOLUTION: JOHN DAVID AND RAHEEL HAVE AVERAGE 68 MARBELS EACH. DAVID HAS 55 AND RAHEEL HAS 78 HOW MANY MARBEL DOES JHON HAVE

Algebra ->  Average -> SOLUTION: JOHN DAVID AND RAHEEL HAVE AVERAGE 68 MARBELS EACH. DAVID HAS 55 AND RAHEEL HAS 78 HOW MANY MARBEL DOES JHON HAVE       Log On


   

Question 880559: JOHN DAVID AND RAHEEL HAVE AVERAGE 68 MARBELS EACH. DAVID HAS 55 AND RAHEEL HAS 78 HOW MANY MARBEL DOES JHON HAVE
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
x= number of marbles John has.
The average number of marbles per person is the sum of all the marbles divided by the number of persons, so
%28x%2B55%2B78%29%2F3=68 .
Multiplying both sides of the equal sign times 3 we get
x%2B55%2B78=68%2A3 ---> x%2B133=204 , and that is the total number of marbles.
Subtracting 133 from both sides of the equal sign we get
x=204-133 ---> x=highlight%2871%29 and that is how many marbles John has.