54
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That's a "mixed number".
mass numbers are whole numbers because the mass number is number of protons in an atom, plus the number of neutrons. you can only have a whole neutron and or proton, therefore, all mass numbers are whole numbers.
29 + 79 + 42 = 150
no
48Estimate to the nearest whole number:2.398 = 246.2 = 46=======..........48