# math (sets)

{ 1,2.3,..........,210 }

How many numbers in the above set are multiples of 3 but not 9 ?

a. 46
b. 47
c. 48
d. 69
e. 70

1. 👍 0
2. 👎 0
3. 👁 125
1. There are obviously 70 multiples of 3 (210/3 = 70)

So, how many multiples of 9 are there?

Figure the difference.

1. 👍 0
2. 👎 0
2. 210/9=23.333

so 70-23 =47

1. 👍 0
2. 👎 0
posted by Thomas
3. Looks good to me.

1. 👍 0
2. 👎 0
posted by Steve

## Similar Questions

1. ### Math

1. Set I contains six consecutive integers. Set J contains all integers that result from adding 3 to each of the integers in set I and also contains all integers that result from subtracting 3 from each of the integers in set I.

asked by Irene on September 12, 2016
2. ### Maths

is it possible to find a sequence with the ruleadd four for wich all terms are multiples of four and eight all terms are even numbers all terms are negative numbers none of the terms are whole numbers if so tell me the sequence

asked by Carla on October 17, 2006
3. ### Math

48,24,6,36,12,54 Which of the following describe this set. A. Numbers that are multiples of 3 B. Numbers that are prime. C. Numbers that are divisible by 6 D. Numbers that are factors of 36 I think its a and c

asked by Taylor on March 7, 2011
4. ### Math

On each of four cards, a different positive integer greater than 1 but less than 20 is written. Exactly 3 of the numbers are multiples of 3, exactly two of the numbers are multiples of 5, and none of the numbers is even. What is

asked by Lenin on July 20, 2016
5. ### math

Find the mean of the following set of numbers. 13, 15, 18, 18, 18, 19, 22, 26, 28, 33 is this correct? 13 15 18 18 18 19 22 26 28 + 33 =210 210/10=21

asked by unknown on July 25, 2009
6. ### math

how to use hundreds chart to answer this;(1)what % of the numbers are multiples of 3 (2)what % of the numbers are multiples of both 2 and 3 (3) what% of the numbers are factors of 100 (4)what % of the numbers are prime numbers? i

asked by wan on November 12, 2012
7. ### algebra & trigonometry

The sum of two numbers is 210. If one number is the square of the other, find the set of numbers. Thanks

asked by daniel on February 11, 2014
8. ### Math Ahhhh

What are the multiples of 24? any number that can be divided by 24 24, 48, 72, 96, etc. Keep multiplying 24 by other numbers to find the multiples. 24,12,2,3,6,8and 1

asked by Backdraft222 on January 24, 2007
9. ### math

if you have 3 rows and three columns and you have to find the hidden numbers. each number is less than 100,the sum of the digits of each number in column 2 is 10,the sum of the numbers in column 1 is 30,row 1 contains odd

asked by corrie on May 19, 2010
10. ### Algebra

Give the list of elements and write in the form with condition the following sets: the set of natural numbers that are multiples of 3

asked by vivian on April 3, 2016

More Similar Questions