গাণিতিক ধাঁধা / Mathematical Puzzle : Who Will Take The Challenge?

উত্তর একটু নিচেই দেখুন

Answer is little below

X² = 81

x+Y²= 45

x-y=?

Answer : 3

X² = 81 or, x=9

x+Y²= 45 or, Y²= 45-9=36 or, y =6

x-y=9-6=3

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