Answer:
7 years old
Step-by-step explanation:
Robert's mother pours a cup of milk for him and realizes that cup has a small crack so she pour the milk into another cup. Robert is not upset because he knows that the amount of milk has remained same.
As Robert is 7 year old . He can groups the milk in the cup according to size , shape and color. He has a better understanding of numbers and can understand problems easily.
open the parenthes. and then after that you'll get 27+12x-15. if you simplify that then you'll get 12x+12
5 = 0.05w
5 / 0.05 = w
100 = w........5 is 5% of 100