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

Among the Pueblo people of the American Southwest,kokopelli was a

Melissa’s father is 194 cm tall. He is 79 cm taller than Melissa. How tall is Melissa?

the court for players 10 and under is 18 feet shorter than the court for single players. how much more area is covered by the tennis court used for singles pla

Which alternative medical system works on the theory that “like cures like”? Traditional Chinese medicine Naturopathy Ayurveda medicine Homeopathy

Which defines reaction mechanism in chemistry? the mixing of two or more liquids to form a solution the steps in a chemical reaction in which products result fr

Which equation represents the general form a circle with a center at (–2, –3) and a diameter of 8 units? A.) x^2+y^2+4x+6y-51=0 B.) x^2+y^2-4x-6y-51=0 C.) x^2+y

how did thee nazca decorate their pots compared to how the moche did it?

Which christian doctrine does the catechism say meets more opposition than any other?

Materials having resistance changes as voltage or current varies are called:

George's ordinary morning routine was interrupted on this day as mr. and mrs. webb enforced the tradition that _____. he must not see his bride or her father on