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

Lee has a jar of 100 pennies. She adds groups of 10 pennies to the jar . She adds 5 groups. What numbers does she say?

Sputnik is associated with

A team of runners is needed to run 1/4 mile relay race. If each runner must run 1/16 mile. How many runners will be needed?

What type of heterotroph is a fish?

Prehistory can be described as _____. what happened last year what happened millions of years ago the time prior to the use of written records

what is 5.5 as an improper fraction?

Which sentence uses punctuation correctly? a. Beneath the tall, tree the family ate a picnic of fruit and muffins. b. Beneath the tall tree the family ate, a

what was the purpose of the articles of confederation?

A man walks into a restaurant and the the waiter says good day Admiral. Why did the waiter call the the man an Admiral?

You are an archaeologist digging for artifacts to learn more about early agrarian societies. You uncover various art and pottery. What might these artifacts te