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sea x el numero buscado
plantamos la ecuación
x+10% = (x-5%) +42
x +x*10/100 = (x -x*5/100)+42
x(1+10/100) = x(1-5/100) +42
x(11/10) = x( 19/20) +42
x(11/10) -x( 19/20) = 42
x(11/10- 19/20) = 42
x(3/20) = 42
x = (42*20)/3
x = 280
prueba
el 10% de 280 = 28
el 5% de 250 = 14
280 +28 = 308
280-14 = 266
308 es mayor que 266 en 42 unidades
Rta: el numero buscado es 280