Problem Solving Word Problems

If m-4 is 7 more than n, then m+9 is how mich than n+2?
a) 5
b) 11
c) 13
d) 15
e) 18

When positive integer n is divided by 5, the remainder is 1. When n is divided by 7, the remainder is 3. What is the smallest positive integer k such that k + n is a multiple of 35.
A. 3
B. 4
C. 12
D. 32
E. 35

Darcy, Gina, Ray, and Susan will be the only participants at a meeting. There will be 3 soft chairs in the room where the meeting will be held, and 1 hard chair. No one can bring more chairs into the room. Darcy and Ray will arrive simultaneously, but Gina and Susan will arrive individually. The probability that Gina will arrive first is 1/3, and the probability that Susan will arrive first is 1/3. The probability that Gina will arrive last is 1/3, and the probability that Susan will (...)

What is the probability of getting a number where at least the ends are multiple of three, among the 9-digit numbers?

De cuántas formas es posible ordenar, en una fila, 3 autos y 2 camionetas si usted dispone de 8 autos y 5 camionetas?
Participa en la comunidad gmatchile.cl, ingresando tu respuesta con una explicación mínima. En donde dice" ¿Un mensaje, un comentario?"
Si tu respuesta es correcta te ganas un libro GMAT.

6 personas asisten a un curso, de las cuales tres son primos, estas se ubican en 6 sillas una al lado de la otra ¿cuál es la probabilidad de que los tres primos no se sienten juntos?
Participa en la comunidad gmatchile.cl e ingresa tu respuesta en "¿Un mensaje, un comentario?". Si tu respuesta es correcta te ganas directamente, sin concursos ni sorteos, un libro GMAT.

What is the value of ab?
(1) the absolute value of (a + b) = a-b
(2) the absolute value of (a + b) =-a-b
Enter your response to "Reply to this article"
An interesting variation of the above problem would be:
"Is ab a positive number?
(1) the absolute value of (a + b) = a-b
(2) the absolute value of (a + b) =-a-b"
You try to give answer to both problems on "Reply to this article"

The product of the squares of two positive integers is 400.
How many pairs of positive integers satisfy this condition?
A) 0
B) 1
C) 2
D) 3
E) 4
Enter your response to "Reply to this article"
An interesting variation of the above problem would be:
"The product of the squares of two integers is 400.
How many pairs of integers satisfy this condition?"
You try to give answer to both problems on "Reply to this article"

A 5 pointed star drawn without lifting the pen, at each tip defines an angle, in the 5 tips we have A, B, C, D and E as angles.
What is the value of the sum of these angles?
Enter your answer where it says "comment on this article"

Si el dígito de las unidades de un número de dos cifras, es igual al dígito "x" de las decenas, disminuido en 2, entonces el opuesto aditivo del número es:
A) 11x-2
B) 2 - 11x
C) 11x+2
D) 1/(2-11x)
E) 1/(2+11x)
Ver desarrollo en http://psu-matematicas.blogspot.com/2012/07/desafio-lenguaje-algenraico.html