The prices of two radios are in the ratio x: y when the prices are both increased by £20, the ratio becomes 5: 2 when the prices are both reduced by £5, the ratio becomes 5: 1 express the ratio x: y in its lowest terms.

x : y = 4 : 1

Step-by-step explanation:

(x+20) : (y+20) = 5 : 2    and   (x-5) : (y-5) = 5 : 1

When we multiply the outer and inner members we get:

2x+40 = 5y+100     and  x-5 = 5y-25

When we arrange the both equations we get:

2x-5y = 60  and x-5y = -20

When we subtract second equation from the first we get:

x = 80   Now we will replace x=80 in the second equation and get:

80-5y = -20 => -5y= -20-80 => -5y= - 100  

Now we will multiply the both sides with number (-1) and get:

5y= 100 => y= 100/5 = 20 => y=20

x : y = 80 : 20 => x : y = 4 : 1

God with you!!!

its c or d   take a lucky guess my dude

step-by-step explanation: i dont