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# Look at this series : 80 ,10 ,70 ,15 ,60 ,----- What number should come next ?

$(a)\;20\qquad(b)\;25\qquad(c)\;30\qquad(d)\;50$

Answer : $\;20$
Look at this series : 80 ,10 ,70 ,15 ,60 ,----- the number should come next is 20