A certain type of concrete mixture is to be made of cement, sand, and gravel in a ratio $1:3:5$ by weight. What is the

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Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Wed Oct 07, 2020 10:52 am

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A certain type of concrete mixture is to be made of cement, sand, and gravel in a ratio $1:3:5$ by weight. What is the greatest number of kilograms of this mixture that can be made with $5$ kilograms of cement?

(A) $13\frac12$
(B) $15$
(C) $25$
(D) $40$
(E) $45$

Answer: E

Source: Official Guide

Source: Beat The GMAT — Problem Solving | Wed Oct 07, 2020 10:52 am

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Re: A certain type of concrete mixture is to be made of cement, sand, and gravel in a ratio $1:3:5$ by weight. What is

by Scott@TargetTestPrep » Sun Oct 11, 2020 5:35 am

Gmat_mission wrote: ↑
Wed Oct 07, 2020 10:52 am
A certain type of concrete mixture is to be made of cement, sand, and gravel in a ratio $1:3:5$ by weight. What is the greatest number of kilograms of this mixture that can be made with $5$ kilograms of cement?

(A) $13\frac12$
(B) $15$
(C) $25$
(D) $40$
(E) $45$

Answer: E

Source: Official Guide

Solution:

If there are 5 kg of cement, there will be 5 x 3 = 15 kg of sand and 5 x 5 = 25 kg of gravel. Therefore, there are 5 + 15 + 25 = 45 kg of the mixture.

Answer: E

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