925 USD

Four classmates saved an annual total 925 USD. The second save twice as the first, third 35 USD more than the second and fourth 10 USD less than the first. How USD save each of them?

Correct result:

a =  150
b =  300
c =  335
d =  140

Solution:


a+b+c+d=925
b=2a
c = 35+b
d = a-10

a+b+c+d=925
b=2•a
c = 35+b
d = a-10

a+b+c+d = 925
2a-b = 0
b-c = -35
a-d = 10

a = 150
b = 300
c = 335
d = 140

Our linear equations calculator calculates it.



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