Primary 6 · Algebra · Question type 4.5
Reconstruct the total, then undo the operations in reverse order to find the letter.
Try the question yourself, or watch the lesson first.
Primary 6, on the MOE Primary Mathematics syllabus.
The lesson · 0 minutes 55 seconds
Watch: 5 packs of balloons, 12 used and 63 left
Another worked example
A girl is 3n years old now. Her cousin is 4 years older than she is. In 5 years' time the total of their two ages will be 56 years. How old is her cousin now?
The working · Eight lines
Written out in full, the way it should appear on paper.
The answer is 25 years.
Practise · Modelled on top school exam questions
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A box holds n red counters, 24 blue counters and 2n green counters. There are 99 counters in the box altogether. How many green counters are there?
Ans: 50 counters
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The last type uses algebra on a figure with unlabelled lengths. Algebra Questions with Diagrams →