x% of y is z and (x + 20)% of y is equal to 3z. Value of y, when expressed in terms of z, is
Explanation:
x% of y = z ... (1)
Also, (x + 20)% of y = 3z ... (2)
(2) - (1)
⇒ 20% of y = 2z
⇒ y = 10z
Hence, option (c).
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