It is: 20+20 = 40
20
20
20, 40, 60
atom have: 20 protons,20 electrons and20 neutrons ion have: 20 protons 18 electrons( metals lose electrons) and20 neutrons
The LCM of 12, 15, and 20 is 60.
The highest common factor of 812 and 20 is 4
Common factors of 18 and 20 are: 1 and 2.
1 and 2 are factors common to 6 and 20
60
It is: 180
The answer is 4
60