Yxcas's answer to Cindy's Primary 6 Maths Singapore question.
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Let Winnie share be 1 unit (which is 25% of Desmond's)
Desmond : Mabel : Winnie
4 units : 1 unit +$28 : 1 unit
25%(4 units) - 60%(1 unit + $28) = $18
1 unit - 0.6 unit = $18 + $16.8
0.4 unit = $34.80
1 unit = $87
Cost of Present = (6 units x $87) + $28 = $550
Desmond : Mabel : Winnie
4 units : 1 unit +$28 : 1 unit
25%(4 units) - 60%(1 unit + $28) = $18
1 unit - 0.6 unit = $18 + $16.8
0.4 unit = $34.80
1 unit = $87
Cost of Present = (6 units x $87) + $28 = $550
Date Posted:
4 months ago
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