The total length of 3 ropes and 9 threads is 390 cm. The length of a thread is
27 of the length of the rope. What is the total length of the 9 threads?
|
Ropes |
Threads |
Total |
Number |
3 |
9 |
|
Value |
7 u |
2 u |
|
Total value |
21 u |
18 u |
39 u |
Length of 3 ropes and 9 threads
= 21 u + 18 u
= 39 u
39 u = 390
1 u = 390 ÷ 39 = 10
Total length of the 9 threads
= 18 u
= 18 x 10
= 180 cm
Answer(s): 180 cm