Mathematics · May / June 2021 · Paper 21 · Question 18
0580
As printed in the paper
The question as text
S O Q P a b NOT TO SCALE S is a point on PQ such that PS : SQ = 4 : 5. Find OS, in terms of a and b, in its simplest form. OS = [2]
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Show the answer and mark scheme
9 a + 4 5 9 b [2]
M1 for 4 9 (b – a) or 5 9 (a – b) or a correct route
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