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Mandara.m. S posted an Question
July 09, 2020 • 22:05 pm
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10 points
10 points
- CSIR NET
- General Aptitude
If the 7-digit number 134x58y is divisible by 72, then the value of (2x+y) is (1) 8 (2) 9 (3) 6 (4) 7
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Anonymous User Best Answer
Answer:1) 8 2x+y=8 Step-by-step explanation: If a number divisible by 72 means, it should be divisible by 9 and 8 I) divisible by 9: Sum of digits should be divisible by 9 So 1+3+4+x+5+8+y=(x+y+21)%9=0...(1) II) divisible by 8: Last three digits should be divisible by 8 Here, 54y should be divisible by 8 So possibilities of y is 0,2,4,6,8 because end number should be even. By calculating, 584 is the number divisible by 8 So y=4 Sub in equation (1), (x+4+21)%9=(x+25) %9=0 So x should be positive and single digit no So x must be 2 satisfying above equation x=2, y=4 So 2x+y=4+4=8plz mark it best😊