Win a copy of Cross-Platform Desktop Applications: Using Node, Electron, and NW.js this week in the JavaScript forum!
programming forums Java Java JSRs Mobile Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
Sheriffs:
Saloon Keepers:
Bartenders:

# how many coins

Helen Thomas
Ranch Hand
Posts: 1759
When Sarah received 10x coins, she then had 5y + 1 times as many coins as he had originally. In terms of x and y, how many coins did Sarah have originally?

Ranch Hand
Posts: 1873
Hi Helen,

Is it supposed to be hard?

is not it simple as,
C + 10x = (5y+1)C
=> C = 2x/y?

Where C is the num of coins Sarah had originally?

Thanks
Maulin

Helen Thomas
Ranch Hand
Posts: 1759
Now that you laid it out neatly it doesn't look hard, does it ?
Thank you.

Question: Does 8x = 16 + 2x?
(1) -3x is greater than or equal to -9
(2) 2x is greater than or equal to 6

Which statement, if any or both is necessary to answer the question ?

II. similarly

If 4 students were added to a dance class, would the teacher be able to put her students evenly into a dance team(s) of 8?
(1) If 12 students were added, the teacher could put everyone in teams of 8 without any leftovers.
(2) The number of students in the class is currently not divisible by 8.

III.

The city council is creating an exploratory group for creating a new park. The city council consists of 20 representatives, 10 Republicans and 10 Democrats. The exploratory group will consist of 3 Republicans and 3 Democrats. How many different combinations are possible of city council members to make up the exploratory group?
[ September 15, 2004: Message edited by: Helen Thomas ]

Arjun Shastry
Ranch Hand
Posts: 1906
1
Originally posted by Helen Thomas:

III.
The city council is creating an exploratory group for creating a new park. The city council consists of 20 representatives, 10 Republicans and 10 Democrats. The exploratory group will consist of 3 Republicans and 3 Democrats. How many different combinations are possible of city council members to make up the exploratory group?
[ September 15, 2004: Message edited by: Helen Thomas ]

3 Rpublicans can be selected in 10C3 ways.
3 Democrats too can be selected in 10C3 ways.
Total numbers of combinations: 10C3 * 10C3 = (10*9*8/3*2*1)* (10*9*8/3*2*1)
= 14400
Now Mr. X is Republican and Mr Y is Democrat.and Mr X and Y are rivals.There are 6 chairs.How many arrangements are possible such that Mr. X and Mr Y are NEVER sitted adjacent?(X and Y are included in exploratory group )
[ September 16, 2004: Message edited by: Arjun Shastry ]

 It is sorta covered in the JavaRanch Style Guide.