అర్థమేటిక్ & రీజనింగ్ గ్రూప్
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M-10=4(S-10) => M= 4S-30 -----1)
M+10=2(S+10) => M=2S+10 -----2
FROM 1 - 2 WE GET
2S-40= 0 => { S=20 } THEN,
M=2(20)+10= 50
