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(a)
17 + 2u ——-> 12p
3 + 2u ——-> 5p
7p ——-> 14
1p ——-> 2
3 + 2u ——-> 5 x 2 = 10
1u ——-> (10 – 3)/2 = 3.5

(b)
perimeter of shaded part ——-> (3.14 x 3.5 x 2) + (17 + 3) x 2 = 62.0 (1 dp)

Ans : (a) 3.5 cm; (b) 62.0 cm (1 dp).

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May i ask about what this book is?Is it the PSLE booklet of 2015-2017?

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Hope this answer your question. 

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(2u + 3) x 12 = (2u + 17) x 5
       24u + 36 = 10u +85
      24u – 10u = 85 – 36
                 14u = 49
                    1u = 49 / 14 = 3.5 cm as (a)’s answer

3.14 x 3.5 x 2 = 21.98
21.98 + 17 + 17 + 3 +3 = 61.98
                                         = 62.0 cm as (b)’s answer

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