SOLUTION: 18)A three-digit number between 300 and 400 is 40 times the sum of its digits. The tens digit is six more than the units digit. Find the number.

Question 23558: 18)A three-digit number between 300 and 400 is 40 times the sum of its digits. The tens digit is six more than the units digit. Find the number.
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
SEE THE FOLLOWING EXAMPLES AND TRY TO WORK OUT YOUR PROBLEM.IF YOU STILL HAVE DIFFICULTY COME BACK
----------------------------------------------------------------------------
A three-digit number divisible by ten has a hundreds digit that is one less than its tens digit. The number is 52 times the sum of the digits. find the number.Thank you!!
LET THE ORIGINAL NUMBER BE HT0 WITH H IN HUNDREDS DIGIT ,T IN TENS DIGIT AND 0 IN UNITS DIGIT SINCE THE NUMBER IS DIVISIBLE BY 10....ITS VALUE =100H+10T
WE ARE GIVEN THAT T-H=1.................I
SUM OF DIGITS=H+T+0=H+T...BUT T=H+1 FROM I..SO SUM OF DIGITS =H+H+1=2H+1
52 TIMES THE ABOVE =52(2H+1)=VALUE OF NUMBER =100H+10T
104H+52=100H+10(H+1)=110H+10
110H-104H=52-10=42
6H=42
H=7
HENCE T=H+1=7+1=8
THE NUMBER IS 780
SEE THE FOLLOWING EXAMPLE.
-----------------------------------------------------------------------------
LET THE ORIGINAL NUMBER BE HTU WITH H IN HUNDREDS DIGIT ,T IN TENS DIGIT AND U IN UNITS DIGIT....ITS VALUE =100H+10T+U
the tens digit of a three-digit number exceeds the hundreds digit by the same amount that the units digit exceeds the tens digit. When the digits are reversed, the new number exceeds the original numer by 198. Find the number.thank you!!
TENS DIGIT EXCEEDS HUNDREDS DIGIT BY T-H
UNITS DIGIT EXCEEDS TENS DIGIT BY U-T
THESE ARE SAME .HENCE
T-H=U-T...OR 2T=U+H..................................................I
WHEN DIGITS ARE REVERSED TNE NEW NUMBER BECOMES
UTH...ITS VALUE = 100U+10T+H
NEW NUMBER EXCEEDS ORIGINAL NUMBER BY =100U+10T+H-100H-10T-U
=99U-99H=99(U-H)
THIS IS EQUAL TO 198
HENCE 99(U-H)=198
U-H=198/99=2.........................................................II
U+H=2T..................FROM....I
ADDING,WE GET
2U=2T+2.....DIVIDING BY 2,WE GET
U=T+1...OR........T=U-1......................AND
H=U-2...........FROM.......II
SO THE ORIGINAL NUMBER IS
HTU = (U-2)(U-1)U...NOW SINCE U IS NOT SPECIFIED WE CAN HAVE VARIOUS VALUES FOR U STARTING FROM 9 TO 2...SINCE U-2 CANNOT BE NEGATIVE..SO THE SOLUTIONS ARE
U=9..........789.............987-789=198
U=8...........678............876-678=198...ETC
U=7..........567
U=6..........456
U=5............345
U=4............234
U=3............123
U=2.............012...WE MAY DISCARD THIS ALSO AS IT CANOT BE CONSIDERED AS 3 DIGIT NUMBER,THOUGH THIS ALSO SATISFIES THE CONDITION THAT 210-12=198
--------------------------------------------------------------------------------

RELATED QUESTIONS
18)A three-digit number between 300 and 400 is 40 times the sum of its digits. The tens... (answered by venugopalramana)

18)A three-digit number between 300 and 400 is 40 times the sum of its digits. The tens... (answered by venugopalramana)

A number between 300 and 400 is 40 times the sum of its digits. The tens digit is six... (answered by stanbon,MathTherapy)

A three-digit number between 300 and 400 is 40 times the sum of its digits. The tens... (answered by ewatrrr)

A number between 300 and 400 is forty times the sum of its digits. The tens digit is 6... (answered by dolly)

A two digit number the sum of its two digits is three times of its units digit and its... (answered by Theo)

A two digit number is two less than six timers the sum of its digits. The tens digit is... (answered by Paul)

This is the closest subject I could find, so, here goes.The real subject is digit... (answered by jim_thompson5910)

a three digit number is 28 times the sum of its digits. the units digit is twice the... (answered by ptaylor)