7/21 + 125/75 + 14/21 + 25/175
= 1/3 + 5/3 + 2/3 + 1/7
= 8/3 + 1/7
= 59/21
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\(\dfrac{7}{21}+\dfrac{125}{75}+\dfrac{14}{21}+\dfrac{25}{175}\)
\(=\left(\dfrac{7}{21}+\dfrac{14}{21}\right)+\dfrac{125}{75}+\dfrac{25}{175}\)
\(=\dfrac{21}{21}+\dfrac{5}{3}+\dfrac{1}{7}\)
\(=\dfrac{21}{21}+\dfrac{35}{21}+\dfrac{3}{21}\)
\(=\dfrac{59}{21}\)
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