Question

Two lengths are in the ratio 3:7. The second length is 42 cm. Find the first
length.

​

Answer 1

Answer:

heya✔️✔️

Step-by-step explanation:

One length =42cm.

One length =3x.

another length =7x.

7x-3x=42

4x=42

x=42/4

x=21/2

x=10.5.

Answer 2

Answer:

Let,

the two lengths be 3x and 7x

ATQ

The second length = 42

or, 7x = 42

or, x = 42/7

or, x = 6

So, first length = 3x

= 3×6 [ x = 6]

= 18