J + M = 32

J = 3M

4M = 32

M = 8

Mark has 8 Marbles, John has 24

Of course you didn't NEED algebra for this, I was just showing off :)

J + M = 32

J = 3M

4M = 32

M = 8

Mark has 8 Marbles, John has 24

Of course you didn't NEED algebra for this, I was just showing off :)

Does it count if I know of someone who's missing a few marbles ?

Less than John

32/4 = 8

John = 8 x 3 = 24

Mark = 8 x 1 = 8

Check it: 24 + 8 = 32

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