K = 5 because according to cross multipication, which is what you need to do to get an answer for these kinds of questions, you have to times 6 by 15 then divide that answer by 18 and you have your answer: 5 (6 x 15 = 90 90 / 18 = 5)
Number is n
sum means add
less than is <
sum of a number and 15 is less than 30
n+15<30
if yo solved yo get
n<15
I think it is 130. I hope this helps! :D
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