In the case above, option b is correct: Marcelina spends the intended amount of money but she bought more than she did intended amount of corn
She buy 50kg of corn in total
So the equation will be:
C= (20, 50) = 20 white, 50 yellow
But 30 while and 20 yellow is needed.
Since C = 20 +50 = 70 corns
While 30 + 20 = 50 corns.
This implies that she spends the intended amount of money but she bought more than she did intended amount of corn and as such, option b is correct.
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