Question

Find A :B : C in the below sum

1. A:B = 3:5 and B:C = 4:9

Answer 1

Given that a:b=3:5and b:c=4:9

Here the common term is b which is found in both the ratios.

Ok now let’s look at the value of b in 1st ratio. It is 5. And 4 in the second.

Now we have to take the LCM of these two values so that we are changing the value of b into the LCM value in both the ratios. The LCM is 20.

So we change the value of b into 20 in the 1st and 2nd ratio. 5*4=20. So multiply the whole 1st ratio by 4 making a:b=12:20

Similarly change the value of b as 36 in the second ratio. 4*5=20. Hence multiply the entire second ratio by 5 making b:c=20:45.

Now that the value of b in both the ratio being same we can concatenate them. Hence a:b:c=12:20:45

Hope it's helpful for you....