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 is the "omitted variable" problem in determining cause and effect? it is a problem that arises when an insignificant variable is given too much weight in a

What is 4log 1/2w+(2log 1/2u-3log 1/2v) written as a single logarithm

ok now , these 2 loll

A chemical leaks into a pond that selectively kills off the phytoplankton (a producer). many of the other organisms in the pond die over a short period of weeks

You can spend $100 on either a new economics textbook or a new cd player. if you choose to buy the new economics textbook, the opportunity cost is:

help meeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Hope someone can help

The market for milk is initially in equilibrium. milk producers engage in an advertising program to encourage milk drinking, which succeeds in shifting consumer

P(9,-4);y= 1/4x+2 in point-slope form

Greg rented a truck for one day. there was a base fee of $20.95 , and there was an additional charge of 77 cents for each mile driven. greg had to pay $166.48 w