Question

in a three digit number, the units digit is thrice the hundreds digit.also,the tens digit is obtained by adding the hundreds digit and the unit digit. if the sum of the digits of the number is 16, then find the original number.​

Answer 1

Answer:

Step-by-step explanation:

he number is 639.

In a 3-digit number,

Like this one: 100a+10b+c

the hundreds digit is twice the tens digit

So a=2b. That works for me.

while the units digit is thrice the tens digit.

Okay, so c=3b. Sounds good.

Also, the sum of its digits is 18.

I believe you are suggesting that a+b+c=18. Sure, okay

What's the number?

Well, we'll start with the sum of the digits, and replace with what is given. So:

a+b+c=18

2b+b+3b=18

6b/6=18/6

b=3

Now that we know what the tens digit (b) is, the remaining digits are easy enough.

a=2b, so a=6

c=3b, so c=9

So the three digit number must be 639.