How to do the 19th question
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let us add X to all
5+X, 11+X, 15+X and 31+X are in proportion
5+X /11+X = 15+X /31+X
=> X= 1/10
5+X, 11+X, 15+X and 31+X are in proportion
5+X /11+X = 15+X /31+X
=> X= 1/10
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