Answer:
80
Step-by-step explanation:
25+55=80
Well, drop 65 cents (the first 250 grams) to get 90 remaining cents. These are 900 additional grams. So, the mass is 0.25+0.9=1.15 kg.

let the solution be 
let the solutions be a = 3, b = 1
is the equation with consistent value.
3t+9≥15 => 3t ≥ 6 => t ≥2 => t= [2,∞)
Hope that helps, have a nice day!! ^^