Question

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

Answer 1

Answer:

18 cm is the answer

Step-by-step explanation:

First, divide 3 by 7 to find its percentage. Multiply that to 42, and that's your answer.

3/7 * 42 = 18

Answer 2

Answer: First length = 18 cm

Step-by-step explanation:



Given: Ratio of two lengths = 3:7

The second length = 42 cm

To find : The first length

Solution :

Let the two lengths be 3x and 7x respectively.

Now, the second length is 42 cm. (given)

$\implies 7x=42$

$\implies x=\frac{42}{7}$

$\implies x=6$

Hence, first length = (3x) = 3×6 = 18 cm.