Difference between revisions of "1995 AJHSME Problems/Problem 22"
Mrdavid445 (talk | contribs) (Created page with "==Problem== The number <math>6545</math> can be written as a product of a pair of positive two-digit numbers. What is the sum of this pair of numbers? <math>\text{(A)}\ 162 \q...") |
m (→Solution) |
||
| (8 intermediate revisions by 7 users not shown) | |||
| Line 4: | Line 4: | ||
<math>\text{(A)}\ 162 \qquad \text{(B)}\ 172 \qquad \text{(C)}\ 173 \qquad \text{(D)}\ 174 \qquad \text{(E)}\ 222</math> | <math>\text{(A)}\ 162 \qquad \text{(B)}\ 172 \qquad \text{(C)}\ 173 \qquad \text{(D)}\ 174 \qquad \text{(E)}\ 222</math> | ||
| + | |||
| + | ==Solution== | ||
| + | |||
| + | The prime factorization of <math>6545</math> is <math>5\cdot7\cdot11\cdot17 =385\cdot17</math>, which contains a three digit number, but we want 6545 to be expressed as ab x cd. Now we do trial and error: | ||
| + | <cmath>5\cdot7=35 \text{, } 11\cdot17=187 \text{ X}</cmath> <cmath>5\cdot11=55 \text{, } 7\cdot17=119 \text{ X}</cmath> <cmath>5\cdot17=85 \text{, } 7\cdot11=77 \text{ }\surd </cmath> <cmath>85+77= \boxed{\text{(A)}\ 162}</cmath> | ||
| + | |||
| + | ==See Also== | ||
| + | {{AJHSME box|year=1995|num-b=21|num-a=23}} | ||
Latest revision as of 22:31, 11 December 2021
Problem
The number 
can be written as a product of a pair of positive two-digit numbers. What is the sum of this pair of numbers?
Solution
The prime factorization of is 
, which contains a three digit number, but we want 6545 to be expressed as ab x cd. Now we do trial and error:
![\[5\cdot7=35 \text{, } 11\cdot17=187 \text{ X}\]](http://latex.artofproblemsolving.com/c/5/f/c5f48648c74e82941d47b152c169d0d03ad23af3.png)
![\[5\cdot11=55 \text{, } 7\cdot17=119 \text{ X}\]](http://latex.artofproblemsolving.com/a/6/4/a64bdea4f1a7a518b33456552c44ecbb468e8bab.png)
![\[5\cdot17=85 \text{, } 7\cdot11=77 \text{ }\surd\]](http://latex.artofproblemsolving.com/3/6/1/361ca82bfea52e6778ac6f3687c2611976a7b2bf.png)
![\[85+77= \boxed{\text{(A)}\ 162}\]](http://latex.artofproblemsolving.com/1/8/f/18f0ea8ccfec284b6d0dff917a81759af971833c.png)
See Also
| 1995 AJHSME (Problems • Answer Key • Resources) | ||
| Preceded by Problem 21 |
Followed by Problem 23 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AJHSME/AMC 8 Problems and Solutions | ||
