Mdm Rohani bought thrice as many lollipops as chocolates. On Children's Day she gave each of her pupils 4 chocolates and 3 lollipops. In the end she had 90 lollipops and 3 chocolates left.
(a) Find the number of pupils Mdm Rohani had
(b) Find the number of lollipops she bought
Solution:
Only algebraic solution available now (as discussed in FB page Maths Model Method)
If number of chocolates = u, then number of lollipops = 3u.
Let number of pupils = p.
Total choc = 4p + 3 = u --> 12p + 9 = 3u
Total lollipops = 3p + 90 = 3u
Elimination method on both:
12p + 9 = 3p + 90 --> 9p = 81, p = 9 i.e there are 9 pupils.
Number of lollipops = 3p + 90 = 27 + 90 = 117.
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