Question

the length of three ribbon are in the ratii 7:5:9 . If the sum of the lengts of the three ribons is 42 cm find the length of the smallest ribbon

Answer 1

let the common ratio be x

first ribbon= 7x

second ribbon=5x

third ribbon=9x

sum of the length of the three ribbons=42 cm

Step-by-step explanation:

7x + 5x + 9x = 42 cm

21x = 42 cm

x = 42/21 = 2cm

the smallest ribbon = 5x = 10 cm

hope this helps!!

Answer 2

Answer:

The length of smallest ribbon = 10 cm

Step-by-step explanation:

Length of 3 ribbons in ratio = 7 : 5 : 9

Let the common ratio be x.

1st ribbon = 7x

2nd ribbon = 5x

3rd ribbon = 9x

Sum of their lengths = 42 cm

7x+5x+9x = 42

21x = 42

x = 42/21

x= 2 cm

Length of 1st ribbon = 7 * 2 = 14 cm

Length of 2nd ribbon = 5 * 2 = 10 cm

Length of 3rd ribbon = 9 * 2 = 18 cm

So, the length of the smallest ribbon = 10 cm