Priscilla Ng's answer to JT Lim's Primary 6 Maths Algebra Singapore question.
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The model is developed by working backwards of the events happened.
Starting with Clara, she had 2 units at first. After receiving from Betty 4 units, she had 6 units in the end.
Since all of them should have equal number in the end, each of them should have 6 units in the end.
Betty had 6 units in the end. Before giving 4 units to Clara, she should have 10 units. (This was after receiving some units from Andrew.)
I repeat the model for Betty to show what she had at first in blue and the number of units is double after receiving some units from Andrew which is 5 units.
Andrew had 6 units in the end and before giving 5 units to Betty, he should have 11 units.
Starting with Clara, she had 2 units at first. After receiving from Betty 4 units, she had 6 units in the end.
Since all of them should have equal number in the end, each of them should have 6 units in the end.
Betty had 6 units in the end. Before giving 4 units to Clara, she should have 10 units. (This was after receiving some units from Andrew.)
I repeat the model for Betty to show what she had at first in blue and the number of units is double after receiving some units from Andrew which is 5 units.
Andrew had 6 units in the end and before giving 5 units to Betty, he should have 11 units.
Date Posted:
4 years ago
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