Maths problem: how to do, thanks?

K : H = 8 : 5 或即 K = 1.6H
K - H = 18
∴ 1.6H - H = 18
∴  H = 30
    K = 48

(K-p) : (H +p) =  6 : 7
∴ 7(K-p) = 6(H+p)
∴ p = (7K - 6H)/13 = 12



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更正
https://tw.answers.yahoo.com/question/index?qid=20210107131151AAPRRGI
的錯解.

因 線段MR//線段SQ 而未說 線段MR//線段OP, 
N, S, Q 三點可能不共線.

△MNS～△MOP
∴ NS : OP = 1 : 4
即 NS = (1/4)OP

△PSQ～△PMR
∴ SQ : MR = 3 : 4
即 SQ = (3/4)MR

OP = MR
∴ NS : SQ = (1/4)OP : (3/4)MR = 1 : 3

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