The answer is 0.45 repeated
1260. You do 1200*.05= 60. Then 1200+60=1260
Answer: half the number?
If you write an equation for it:
Let the number be x
1/2x = x - 1/2x
Answer:
A. Stone bridges to steel bridges=
12 : 20
6 : 10
3 : 5
answer = 3 : 5
B. Steel bridges to Stone bridges
20 : 12
10 : 6
5 : 3
answer = 5 : 3
Total bridges = 20+12=32
C. Total bridges to steel bridges
32 : 20
16 : 10
8 : 5
answer = 8 : 5
