An artist has completed one-fourth of...

An artist has completed one-fourth of a rectangular oil painting. When he will paint another 100 square centimetres of the painting, he would complete three-quarters of the painting. If the height of the oil painting is 10 cm, determine the length (in cm) of the oil painting. (a) 10 (b) 15 (c) 20 (d) 25

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