a:b = 1:3 b:c = 6:5
find a:b:c
2 2/5
1/19^4 missing value
6-3/5-4/7+2/9
1/19^4
76044673116
1307514184
35564626482
112598220672
5^-3
Find the sum of first 6 terms of the G.P 0.1,0.01,0.001
p-5=9
5x*10y+5y+5y+4z*z/8