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| 1. |
a no. consists of 2 digits whose sum is 12 .If 8 is added to the no. the digit are reversed find the no. |
| Answer» LET one digit of the number be x , then its ten digits digits will be (8−x) . So , given number =10(8−x)+x =80−10x+x =80−9xNow if digits are reversed , then Number obtained =10x+(8−x) =10x+8−x =9x+8According to QUESTION (80−9x)+18=9x+8 98−9x=9x+8 90=18x x=5⇒ given number =80−9x =80−9×5 =80−45 =35 ∴ the number is 35 | |