Find the least number which when divided by 12, 16 and 20 leaves remainder 7 in each case.
वह सबसे छोटी संख्या ज्ञात कीजिए जिसे 12, 16 और 20 से भाग देने पर प्रत्येक बार 7 शेष बचे।
Answer and explanation are free to read — no sign-in required. / उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।
Correct Answer / सही उत्तर
D. 247
247
Explanation / व्याख्या
Since the remainder is the same (7) in each case, first find the LCM of 12, 16, and 20.
12 = 2² × 3
16 = 2⁴
20 = 2² × 5
Therefore,
LCM = 2⁴ × 3 × 5 = 240
Now add the common remainder 7:
Required number = 240 + 7 = 247
चूँकि प्रत्येक स्थिति में शेषफल 7 समान है, इसलिए पहले 12, 16 और 20 का LCM ज्ञात करेंगे।
12 = 2² × 3
16 = 2⁴
20 = 2² × 5
अतः,
LCM = 2⁴ × 3 × 5 = 240
अब इसमें शेषफल 7 जोड़ेंगे:
अभीष्ट संख्या = 240 + 7 = 247
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