A number has two digits whose sum is 7 if 45 is added to this number t

1.	A number has two digits whose sum is 7 if 45 is added to this number the digits gets interchanged find the number
Answer» ANSWER: the no is 16 Step-by-step explanation: let the unit digit is X and decimal place is Y then no is 10Y+X , now given X+Y =7 (1) on ADDING 45 digit gets INTERCHANGED so 10Y+X +45= 10X+Y i.e. 9Y-9X=-45 Y-X=(-5). (2) from eq 1and 2 X=6and Y=1 so the no is 16

A number has two digits whose sum is 7 if 45 is added to this number the digits gets interchanged find the number

Answer»

ANSWER:

the no is 16

Step-by-step explanation:

let the unit digit is X and decimal place is Y then no is 10Y+X , now given X+Y =7 (1)

on ADDING 45 digit gets INTERCHANGED so

10Y+X +45= 10X+Y

i.e. 9Y-9X=-45

Y-X=(-5). (2)

from eq 1and 2 X=6and Y=1 so the no is 16

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A number has two digits whose sum is 7 if 45 is added to this number the digits gets interchanged find the number

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