MATHS
posted by BRENDAN .
Please show the quickest way to do this question?
Amanda has 20 coins in her purse. She has only 10c,20c and 50c coins, and their total value is $5. If she has more 50c than 10c coins, how many 10c has she?
Thank You

MATHS 
Dean
Are you in algebra using variables 'c'?

MATHS 
BRENDAN
I'm not sure what you mean.

MATHS 
Dean
What grade are you in?

MATHS 
BRENDAN
YEAR 4

MATHS 
Dean
c stands for cents?

MATHS 
BRENDAN
yes c stands for cents.

MATHS 
Dr Russ
I got 4 x 50c = $2
2 x 10c = 20 c
14 x 20c = $2.80c
so she has 2 x 10c 
MATHS 
Reiny
Since you are in year 4, you will be able to solve this algebraically.
let the number of 10c pieces be x
let the number of 20c pieces be y
let the number of 50c pieces be (20xy)
10x + 20y + 50(20xy) = 500
reduces to
4x + 3y = 50
so we need positive integer solutions for x and y
clearly x has to be between 0 and 13
after only two tries, I got
x = 2, and y = 14
then
number of 10c pieces = 2
number of 20c pieces = 14
number of 50c pieces = 20214 = 4
check: 2x10 + 14x20 + 4x50 = 500
Respond to this Question
Similar Questions

MATHS
Could you please explain the quickest way to calculate these questions? 
Maths
I have 50 coins, some 10c and the rest 20c. Altogether they total $8.20. How many of each coin do I have? 
maths
A bag contained a number of 20cents, 50cents and $1 coins. 1/3 of the 20cents coins is equal to 2/3 of the 50cents coins. There are 3/5 as many 50cents coins as $1 coins. If the total value of these coins is $23.10, how many coins … 
maths
Andrew has 7 20c coins and 5 50c coins in his piggy bank. What is the smallest number of coins he might have to shake out to be certain of having 2 50c coins? 
5th grade math
I need to use quarters, dimes, nickles and pennies to make the following: $1.53 in 12 coins $2.53 in 20 $2.32 in 15 coins $2.00 in 22 $1.45 in 10 coins $1.76 in 16 coins $0.85 in 11 coins $1.01 in 12 coins $1.29 in 15 coins 
math
a lady has only 20 paisa coins and 25 paisa coins in her purse if she has 50 coins in totalling rupees 11.50 how many coins of each kind does she have 
math
A collection of coins contains only 10cent and 5cent coins.There are x 5cent coins in the collection. Write an algebraic expression for of following. * The total value of the coins if for every three 10cent coins there are five … 
Math
I have $46.20 in my pocket in $2, $1, 50c, 20c, 10c and 5c coins, and I have an equal number of each coin type. That number is? 
Maths
A purse contains 25 paisa and 50 paisa coins.the number of 25 paisa coins is three times the number of 50 paisa coins.if the total money in the purse is rs 50.find the number of coins of each types. 
math
Dani is about to travel on a bus, and she knows she must tender the exact fare. She is not sure what this is, but she knows it is greater than $1 and less than $3. What is the minimum number of coins she must carry to be sure of carrying …