A new mathematical challenge from Sonya
Once upon a time, in the distant past, Mathlantis was a kingdom in which Sonya’s ancestor was the queen, or that’s what she likes to think!
Queen Sonya Elizabeth’s kingdom of Mathlantis was divided into 4 large regions and she had a castle in each.
Wishing to organize a grand and sumptuous reception with the heads of State of Mathsengard and Matharnia, neighboring kingdoms, she asked her advisor which of her castles was the most appropriate. For this, the advisor had to determine the value of each castle.
Help him find the value of castle D, knowing that castle A is worth 30, castle B is worth 48 and castle C is worth 51.
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