Three-quarters 3384

The sum of the two numbers is 75. Find these numbers. Three-quarters of the first are one-seventh of the second.

Correct answer:

a =  12
b =  63

Step-by-step explanation:


a+b=75
3/4a = b/7

a+b=75
3/4·a = b/7

a+b = 75
21a-4b = 0

Pivot: Row 1 ↔ Row 2
21a-4b = 0
a+b = 75

Row 2 - 1/21 · Row 1 → Row 2
21a-4b = 0
1.19b = 75


b = 75/1.19047619 = 63
a = 0+4b/21 = 0+4 · 63/21 = 12

a = 12
b = 63

Our linear equations calculator calculates it.



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