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

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) (Show Source): You can put this solution on YOUR website!
= 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
.
Multiplying both sides of the equal sign times 3 we get
---> , and that is the total number of marbles.
Subtracting 133 from both sides of the equal sign we get
---> and that is how many marbles John has.