Smriti Shriniwas Mandhana becomes World No. 1 ODI batswoman. In June 2018, the Board of Control for Cricket in India named her as the Best Women's International Cricketer.
The weights of 4 boxes are 20, 30, 40 and 60 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?