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In a two - digit numder, …

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In a two - digit numder, the ten 's digit is three times the unit 's digit . when the numder is decreased by 54, the digit are reversed . find the number.......,???????? Plz tell me..??☺

Posted by Shreya Verma 6 years, 11 months ago

CBSE > Class 10 > Mathematics

2 answers

Varun Punia 6 years, 11 months ago

Let tens digit number be x and ones digit number be y ATQ x=3y. .........(1) And 10x+y-54=10y+x. ..........(2) Simplifying eq... 2 We get , X-Y =6. ...........(3) Substituiting ep.... 1 in eq..... 3 We get, 3y-y=6 2y=6 y=3 So, x=3*y =3*3 =9 So the two digit no. is 93......

1Thank You

Ram Kushwah 6 years, 11 months ago

Let the unit digit =x then 10th digit=3x (given)

number =3xx10+x=31x----------------(1)

if digitd are reversed then

number=10x+3x=13x--------------(2)

as per given

31x-54=13x

18x=54. x=3

so number is 93

1Thank You

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CBSE > Class 10 > Mathematics