Framing the equation: 1 Mark
Steps: 2 Marks
Result: 1 Mark
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Let the no. Of Cadbury shots $=y$
Then no. of 5-star chocolates $=20-y$
As given in the question, Cadbury shots worth rupees 3 and 5-star worth rupees 11.
Total cost of Cadbury shots is
$=No.ofshots\times costofeach=3\times y=3y$
Total cost of 5 star is
$=No.of5star\times costofeach=(20-y)\times 11=220-11y$
Total worth of chocolates in carton $=100$
$\Rightarrow 3y+220-11y=100$
$\Rightarrow 220-100=11y-3y$
$\Rightarrow 120=8y$
$\Rightarrow y=15$
There are 15 Cadbury shots and 5 5-star.