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Introduction to Rational Numbers

In a three di...

Question

In a three digit number the hundreds digit is twice the tens digit while the units digit is thrice the tens digit also the sum of its digits is 18 find the number

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Solution

ten digit number =x
hundred digit number = 2x
unit digit number= 3x

number is 100×(2x) + 10 x + 3x

sum of digits = 2x + x + 3x = 18
6x= 18
x=3

Number= 100×(2×3) + 10×3 + 3×3 =600+ 30 +9
=639

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