Una compañía de fabricación de muebles suele emplear 18 horas para ensamblar 12 muebles. Para determinar el número de muebles que se lograrán ensamblar en 3 horas, se propusieron los siguientes cálculos; aquel que permite verificar de manera correcta esta relación es

The time required is 4.5 hours.

Step-by-step explanation:

A furniture manufacturing company typically takes 18 hours to assemble 12 pieces of furniture. To determine the number of pieces of furniture that will be assembled in 3 hours, the following calculations were proposed; the one that allows to verify this relationship correctly is

The 12 pieces of furniture assembled in 18 hours

So, 1 piece assembled in 18 / 12 hours = 1.5 hours  

And 3 pieces assembled in 3 x 1.5 = 4.5 hours

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40