PSLE Math 2020 Paper 2 Question 5
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(Area of Shaded Parts in a Square Question)
PSLE Math 2020 Paper 2 Question 5
Ans: 300 cm^2
5 x 4 = 20
Top half -> 3/5 x 20u = 12u
Bottom half -> 1/2 x 20u =10u
22u -> 165
1u -> 165 ÷ 22 = 7.5
40u -> 7.5 x 40 = 300
OR
1/2 x 3/5 = 3/10 shaded (top)
1/2 x 1/2 = 1/4 shaded (bottom)
total shaded -> 3/10 + 1/4 = 11/20
11/20 -> 165
1/20 -> 165 ÷ 11 = 15
20/20 -> 15 x 20 = 300