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Razonamiento Cuantitativo: Matemáticas 7º

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Razonamiento Cuantitativo: Matemáticas 7º

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Desafía tu razonamiento numérico

Created by

MARILY RIOS VEGA
MARILY RIOS VEGA
Colombia

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Razonamiento Cuantitativo: Matemáticas 7º
 

Razonamiento Cuantitativo: Matemáticas 7ºOnline version

Desafía tu razonamiento numérico

by MARILY RIOS VEGA
1

Si 3/4 de un número es 60, ¿cuál es el número?

2

Un jugo contiene 250 ml y 40% es jugo puro. ¿Cuánta agua hay si el resto es agua?

3

Si un libro tiene 240 páginas y voy leyendo a 20 páginas por día, ¿cuántos días tomará terminarlo?

4

Un número aumenta en un 25% y luego se reduce en un 20%. ¿La variación neta es de?

5

Una caja tiene 6 kg de arroz; si se reparte en 3 bolsas, ¿cuánto pesa cada una?

6

El perímetro de un rectángulo es 34 cm. Si la base es 9 cm, ¿cuál es la altura?

7

Una familia gasta 120€ en 4 semanas. ¿Gasto promedio semanal?

8

Si 5x = 60, ¿cuál es x?

9

La mitad de un número es 18. ¿Cuál es el número?

Explicación

Solución: x·3/4=60 ⇒ x=60·4/3=80. Las otras opciones no satisfacen la igualdad.

40% de 250 ml = 100 ml de jugo puro; 150 ml son agua. Error común: confundir porcentajes.

240 ÷ 20 = 12 días. Las demás suposiciones no dividen correctamente el total.

Incremento 25% ⇒ x·1.25; luego ×0.8 ⇒ x·1.0. Rendondeo: neto 0%? En realidad 1.25×0.8=1.0, es decir, 0% neto. Ajusté para claridad: incremento neto 0%.

Dividir 6 kg entre 3 da 2 kg por bolsa.

P = 2(b+h) ⇒ 34 = 2(9+h) ⇒ h = 8 cm.

Promedio semanal = 120 ÷ 4 = 30 €. Las otras no representan el promedio.

Dividir ambos lados entre 5: x = 60/5 = 12.

Si x/2 = 18, entonces x = 36. Las otras no satisfacen la ecuación.

 
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