You subtract 54 from the mass number.
to find the range of numbers, you take the largest number and subtract the smaller number. 119-(-54)=119+54=173
6x9=54
121
54
45
48
18
It is: 9*54 = 486
It is: 100/54 times 2619 = 4850 Check: 54% of 4850 = 2619
The number is 54. The sum of its digits is 5 + 4 = 9. 54/9 = 6.
54 (5 + 4) x 6 = 54