AC Lim's answer to Chris's Primary 6 Maths Algebra Singapore question.

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AC Lim
Ac Lim's answer
13108 answers (A Helpful Person)
1st
Beaker A have 4u.
When he poured ¼ into breaker C.
Beaker A left with 3u
3u → 120 ml
1u → 40 ml
Hope this clarifies your doubts.