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sesenic
2 months ago
10

A charity bingo game costs $2 per round and has a $13 entry fee for an adult. It costs $3 per round and a $10 entry fee for a ch

ild. For how many rounds of bingo are the costs the same for an adult and a child?
a 2
b 3
c 4
d 5
Mathematics
2 answers:
AnnZ [12.3K]2 months ago
4 0

En este problema definimos:

x: cantidad de rondas para adultos

y: cantidad de rondas para niños

Queremos conocer para cuántas rondas el costo de jugar bingo es igual para adultos y niños.

Costo adulto = 2x + 13

Costo niño = 3y + 10

Igualando:

2x + 13 = 3y + 10

Buscamos que el número de rondas sea igual, es decir, x = y:

2x + 13 = 3x + 10\\2x-3x = 10-13\\-x = -3\\x = 3

Con esto, comprobamos que a las 3 rondas ambos costos coinciden.

Respuesta:

3

Zina [12.3K]2 months ago
3 0

Respuesta:

b. 3

Explicación paso a paso:

Formamos dos ecuaciones, una para adultos y otra para niños:

Sea x la cantidad de rondas.

Adulto (A):

A = 2x + 13

Niño (C):

C = 3x + 10

La pregunta es: ¿para qué valor de x son iguales A y C? Por lo tanto, resolvemos:

      A = C

2x + 13 = 3x + 10     restamos 10 en ambos lados

2x + 3 = 3x

Restamos 2x:

3 = x

Por ende, la cantidad de rondas es 3.

Verificación:

A = 2x + 13    C = 3x + 10

= 2(3) + 13           = 3(3) + 10

= 6 + 13              = 9 + 10

= 19 dólares           = 19 dólares

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