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Resolvemos.
1/4a = 2/7b
a + b = 750
Despejo a en ecuación 1
a + b = 750
a = 750 - b
Sustituyo el despeje de a en ecuación 2
1/4 (7500 - b) = 2/7b
7500 - b = 8/7b
- 7b + 7 (7500) = 8b
- 7b + 52500 = 8b
- 7b - 8b = - 52500
- 15b = - 52500
b = - 52500/-15
b = 3500
El valor de b sustituyo en el despeje de a
a = 750 - b
a = 7500- 3500
a = 4000
Solcuión.
A tiene = $4000
B tiene = $3500