alexandraemk240 alexandraemk240

01-07-2018
Mathematics

contestada

A bag has red and white counters in the ratio 4:7. If I add 4 white counters the ratio becomes 1:2. Work out the number of red counters in the bag.

Respuesta :

konrad509 konrad509

01-07-2018

[tex]\dfrac{4x}{7x+4}=\dfrac{1}{2}\\ 7x+4=8x\\ x=4\\\\ 4x=4\cdot4=16[/tex]
16 red marbles

Answer Link

Otras preguntas

What are four possibilities for concluding an essay?

why are the seasons at higher latitudes different from seasons at latitudes near the equator

The Nile begins as two separate rivers, the ___________ flowing from eastern Africa and the __________ from central Africa?

3k-1=7k+2How do I solve this? and other problems like this?

$1.06 what is it rounded to the nearest cent

How do you put 11.85 as a fraction

An oil tanker empties at 3.5 gallons per minute. Convert this rate to cups per second. Round to the nearest tenth.

What country is located at 15 degree north 105 degree east

How do brakes help an inline skater stop?

What is 0.03703704 as a fraction