Sunday

November 23, 2014

November 23, 2014

Posted by **Shawna Lynn** on Monday, April 29, 2013 at 2:33pm.

Determine the digits of R from these clues.

The first digit is the answer when the third digit is divided by 2.

The second and third digits add to 7.

The second digit minus the first digit is 1.

R is a three-digit number: ____

I have never understood how to do this.

- Math -
**Steve**, Monday, April 29, 2013 at 2:50pmCall the digits a,b,c left-to-right

a = c/2

b+c = 7

b-a = 1

we see that c=2a, so

b+2a=7

b-a=1

subtract to get

3a=6

a=2

Thus c=4 and b=3

R=234

Or, just working with the specs,

c must be even, since it can be divided by 2. So, R is one of the forms

1x2

2x4

3x6

4x8

Since the last two add to 7, R must be

152

234

316

Since 2nd-1st=1,

R=234

**Answer this Question**

**Related Questions**

Math - Determine the digits of Y from these clues. The digits of Y add to 18. ...

math - Find the four-digit number described by these three clues. 1) The first ...

math - Solve the mathematical puzzle. Determine the digits of F from these clues...

math - this code has five digit 1,2,3,4,5. the first digit plus the second digit...

math - Find a six-digit even number containing no zeros and no repeating digits ...

Math - i am a four digit number. all of my digits are different. my first digit ...

Math - A number has 4 digits. The sum of the first and last digit is twice the ...

Math - A number has four digits. the sum of the first and last digits is twice ...

math - use the clues to find the 7th digit mystery number. * Its is between 1 ...

math - use the clues to find the 7th digit mystery number. * it is between 7 and...