Pls help us with the math Thank you

total no. of tins = 21
no. of tins given to one man = 21/3 = 7 tins
total paint (taking full tin as y) = 7y +(½ × 7 y)
= 7y + 3.5 y = 10.5 y
amount of paint given to one man in terms of y = 10.5 y / 3
= 3.5y
so
man 1 will recieve 3 full tins and a ½ full tin
man 2 will recieve 3 full tins and a ½ full tin
man 3 will recieve 1 full tin and a 5 ½ tins
each man now have recieved equal amount of paint but not tins since we didn't distribute the empty tins let's distribute it such that each man in total ( including filled tins) recieve 7 tins
then your answer is
man 1 will recieve 3 full tins , a ½ full tin and 3 empty tins.
man 2 will recieve 3 full tins , a ½ full tin and 3 empty tins.
man 3 will recieve 1 full tin , 5 ½ tins and 1 empty tin.
attached a written working as well :)
hope you understood
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