PSLE Math 2019 Paper 2 Question 17
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(White and Grey Triangles Pattern Question)
PSLE Math 2019 Paper 2 Question 17
(a) Ans: 15 (Number of white triangles), 10 (number of grey triangles)
(b) Ans: 62 500
Figure 250 → 250 × 250 = 62 500
(c) Ans: 50.2%
odd figure: white ∆ > grey ∆
even figure: white ∆ < grey ∆
grey: (62 500 + 250)/2 = 31 375
31 375/62 500 × 100% = 50.2%
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