0 Deepak BoraNewbie Asked: July 23, 20202020-07-23T13:06:16+05:30 2020-07-23T13:06:16+05:30In: Competition If a:b = 7:5 and c:d = 2a:3b, then ac:bd is ? 0 Question of ratio for competition exams ratio problem Share Facebook 4 Answers Voted Oldest Recent AARCHIT JOSHI 2020-07-23T13:34:41+05:30Added an answer on July 23, 2020 at 1:34 pm Since a and b are in the ratio 7:5 Then, Let a = 7k and b = 5k %3D Then c = 2a = 2 x 7k = 14k %3D d = 3b = 3 x 5k = 15k %3D – c:d = 14:15 %3D – ac : bd = 14 x 7:15 x 5 = 98:75 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp aarchitjoshi 2020-07-23T13:36:46+05:30Added an answer on July 23, 2020 at 1:36 pm Since a and b are in the ratio 7:5 Then, Let a = 7k and b = 5k %3D Then c = 2a = 2 x 7k = 14k %3D d = 3b = 3 x 5k = 15k %3D – c:d = 14:15 %3D – ac : bd = 14 x 7:15 x 5 = 98:75 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp aarchitjoshi 2020-07-23T13:40:00+05:30Added an answer on July 23, 2020 at 1:40 pm Since a and b are in the ratio 7:5 Then, Let a = 7k and b = 5k Then c = 2a = 2 x 7k = 14k d = 3b = 3 x 5k = 15k c:d = 14:15 ac : bd = 14 x 7:15 x 5 = 98:75 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Tahia binte Humayun 2020-07-23T14:24:57+05:30Added an answer on July 23, 2020 at 2:24 pm a:b = 7:5 c:d = 2a:3b ac:bd = ? As a:b = 7:5 we get a=7 and b=5 So, c:d = 2*7:3*5 or, c:d = 14:15 Therefore, c = 14 and d = 15 ac or, a*c = 7*14=98 and bd or, b*d = 5*15=75 So, ac:bd = 98:75 (answer) 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Add a Video to describe the problem better. Video type Youtube Vimeo Dailymotion Facebook Choose from here the video type. Video ID Put Video ID here: https://www.youtube.com/watch?v=sdUUx5FdySs Ex: "sdUUx5FdySs". Click on image to update the captcha. Save my name, email, and website in this browser for the next time I comment. Related Questions What is the fee structure of Woodstock School, Mussoorie? How can I get admission there? What is your review of Lawrence School Lovedale? Lawrence School is a Premium Boarding School in Tamil Nadu. Why do students from top-notch schools in India (Doon, Welham, Bishop Cotton school of Shimla and Mayo College ... Which is the most expensive school in India? I want my children to have the best education. In ... What is it like to study at The Doon School? Why should one study at the doon school? ...

## Since a and b are in the ratio 7:5

## Then, Let a = 7k and b = 5k %3D

## Then c = 2a = 2 x 7k = 14k %3D

## d = 3b = 3 x 5k = 15k %3D

## – c:d = 14:15

## %3D

## – ac : bd = 14 x 7:15 x 5 = 98:75

Since a and b are in the ratio 7:5

Then, Let a = 7k and b = 5k %3D

Then c = 2a = 2 x 7k = 14k %3D

d = 3b = 3 x 5k = 15k %3D

– c:d = 14:15

%3D

– ac : bd = 14 x 7:15 x 5 = 98:75

Since a and b are in the ratio 7:5

Then, Let a = 7k and b = 5k

Then c = 2a = 2 x 7k = 14k

d = 3b = 3 x 5k = 15k

c:d = 14:15

ac : bd = 14 x 7:15 x 5 = 98:75

a:b = 7:5

c:d = 2a:3b

ac:bd = ?

As a:b = 7:5

we get a=7 and b=5

So, c:d = 2*7:3*5

or, c:d = 14:15

Therefore, c = 14 and d = 15

ac or, a*c = 7*14=98

and bd or, b*d = 5*15=75

So, ac:bd = 98:75 (answer)