maths
posted by ssssss .
Xuan Yun has a total of 24 coins in her piggy bank. Some of them are twentycent coins and the others are fiftycent coins. Thetotal savings is $6.90. How many twentycent and fiftycent coins does she have?

number of 25 cent coins  x
number of 50 cent coins  24x
25x + 50(24x) = 690
solve for x and backsubstitute
Respond to this Question
Similar Questions

Math problem I need help with
Combination of coins that can be used; fiftycent piece, quarters, dimes, nickels, and pennies Q: My 3 types of coins total 37 cents. I have fewer than 4, but more than 1, of each coin. What are the coins? 
math
Sasa had some 20cent and 50cent coins. 7/8 of the coins were 20cent coins and the rest were 50cent coins.After Sasa had spent $72.50 worth of 50cent coins and 5/7 of the 20cent coins, she had 2/7 of the coins left. Find the total … 
Grade 5 Maths
A coin box contained some twentycent and fiftycent coins in the ratio 4:3. After 20 twentycent coins were taken out to exchange for fiftycents coins of the same value and put back in the box, the ratio of the number of twentycent … 
maths
A coin box contained some twentycent and fiftycent coins in the ratio 4 : 3. After 20 twentycent coins were taken out to exchange for fiftycents coins of the same value and put back in the box, the ratio of the number of twentycent … 
What did I did wrong MATH
The ratio of number of onedollar coins to the number of fiftycent coins in a box was 3:4. Six onedollar coins were removed and some fiftycent coins if the same amount were added. The ratio of the number of onedollar coins to the … 
Maths  Year 10  Simult. Equations
Q) Julie has $3.10 in change in her pocket. If she has only 50 cent and 20 cent pieces and the total number of coins is 11, how many coins of each type 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
Jun Wei has 12 more 10 cent coins than 20 cent coins. The total value of all his coins is $5.40. Find the total number of coins he has. 
Math
Jun Wei has 12 more 10 cent coins than 20 cent coins. The total value of all his coins is $5.40. Find the total number of coins he has. 
Grade 6, ratio
The ratio of the number of one dollar coins in a box was 3:4.six one dollar coins were removed & some fifty cent coins of the same amount were added.the ratio of the number of one dollar coins to the number of fifty cent coins then …