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Hope this help

Date Posted:
4 months ago

How did you arrive at K = ___+1u+15? I am sorry I couldn’t understand that.

If ken give 15 to Lisa, Lisa have 15 more than Ken.

On order to have 21 more than Ken, Ken should give 3 dollars to Lisa, Since ken give Lisa, Lisa will have 6 dollars more (as she get 3 and Ken less 3).

So is 3+3+15=21.