Mario have 19 stamps in his collection.
What is the unitary method?
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
Liam has 10 stamps in his collection . Julius has 87 stamps in his collection.
We have given that Julius has three times as many stamps in his collection as his freinds liam and mario combined.
Julius = 3(Liam + mario )
Liam = 10 stamps
Julius = 87 stamps
Substitute;
Julius = 3(Liam + mario )
87 = 3(10 + m)
29 = 10 + m
m = 19
Thus, mario have 19 stamps in his collection.
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