Answered

IDNLearn.com is your go-to platform for finding reliable answers quickly. Discover trustworthy solutions to your questions quickly and accurately with help from our dedicated community of experts.

Dave Bowers collects U.S. gold coins. He has a collection of 49 coins. Some are​ $10 coins, and the rest are​ $20 coins. If the face value of the coins is ​$690​, how many of each denomination does he​ have?
How many $10 coins does he have?
How many $20 coins does he have?

Sagot :

He has twenty nine $10 coins and twenty $20 coins

Let x be number of $10 coins and y be number of $20 coins
x + y = 49. Number of coins
10x + 20y = 690. Value of coins

Multiply the first equation by 10
10x + 10y = 490

Subtract from the second equation
10y = 200
y = 20

Substitute into equation 1
x + 20 = 49
x = 29
Thank you for using this platform to share and learn. Keep asking and answering. We appreciate every contribution you make. For dependable and accurate answers, visit IDNLearn.com. Thanks for visiting, and see you next time for more helpful information.