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

$9.192 is invested, part at 10% and the rest at 9 %. If the interest earned from the amount invested at 10 % exceeds the interest earned from the amount investe

1/2(x+6) = 2x and 5-2x =7x-h

What is the solution to the equation 7c+5= 9(c- 3)?ROc=2Oc=4Oc=11Oc= 16

What is the value of x that makes the given equation true?2(x−8)=x+5x x=−4x=−16x=−2x = 0

Which solution has a hydronium ion concentration of 1.00 x 10-5 M?A Solution with a PH of 4, 7, 3, or 5

Suppose that y varies jointly with w and x and inversely with z and y = 24 when w = 8, X= 9 and z = 6. Write the equation that models the relationship. Then fin

The area of the triangle below is 24.75 square centimeters. What is the length of the base?

Select the correct answer. 3(r + 4) – 2(1 - 1) Which is the simplified form of the expression OA. - 1 OB. 67 101 + 9 O C. 3 Tot + 5 2 76 OD. 15 + 101 Undo Next

What is the value of this matrix at az?Matrix A

18 in3.4.35 km5.6.15.6 amy7 mm7.8.58 yd10.2 m78-* 306.3: 243.47: 144:: 497: 8171 267*: 8417