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1). 982). 893). 784). 87 |
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Answer» Let the tens and UNITS DIGITS of the NUMBER be X and y respectively x × y = 72 ⇒ y = 72/x 10x + y + 9 = 10y + x ⇒ 9Y – 9x = 9 ⇒ 72/x – x = 1 ⇒ x2 + x – 72 = 0 ⇒ (x + 9)(x – 8) = 0 ⇒ x = 8 y = 72/8 = 9 ∴ Number is 89 |
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