Divide 1430kg in a ratio of 3: 3: 5

When you do ratios, you can divide the main number by the sum of all the numbers in the ratio. this will give you "groups" or "units" that you divide the number into. 

so first, we add 3+3+5=11

that means that the 1430 must be divided into 11 groups or units

1430/11=130

so each of this parts would have 130 kilograms in it.

then in a ratio 3:3:5 means 3 such parts, 3 such parts and 5 such parts

3*130=390
5*130=650

so the answer is

390:390:650

1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable