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

Help me please. Help me please. Help me please.

Read this excerpt from "A Modest Proposal" by Jonathan Swift: Infant's flesh will be in season throughout the year, but more plentiful in March, and a little be

True or False? Explain your answer. Because sin(−t) = − sin t, it can be said that the sine of a negative angle is a negative number.

A digital scale reports a 10kg weight as weighing 9.998kg.what is true about this A.the scale is both accurate and precise B.the scale is neither precise nor a

A basketball player has a 50% chance of making each free throw. what is the probability that the player makes exactly five out of eleven free throws?

A number decreased by 18 is equal to the product of the number and 7.

this is the last one ok

do you think the cost outweigh the benefits of treaties that serve to protect biodiversity? explain

a 100 N block on a 30 degree incline, is being held motionless by friction. The coefficient of static friction between the block and the plane is 0.60. The forc

A nontoxic furniture polish can be made by combining vinegar and olive oil. The amount of oil should be three times the amount of vinegar. How much of each ingr