Wednesday

July 23, 2014

July 23, 2014

Posted by **Al** on Thursday, April 19, 2012 at 12:03am.

7/8 of the coins were 20-cent coins and the rest were 50-cent coins.After Sasa had spent $72.50 worth of 50-cent coins and 5/7 of the 20-cent coins, she had 2/7 of the coins left. Find the total amount of money Sasa left.

- math -
**Steve**, Thursday, April 19, 2012 at 12:12pmlet there be:

c coins

t 20¢ coins

f 50¢ coins

7/8 c = t

1/8 c = f

so, t = 7f

72.50 is 145 of the 50¢ coins

(f + t) - 145 - (5/7 t) = 2/7 (f+t)

since t = 7f,

f + 7f - 145 - 5f = 2/7 * 8f

f = 203

so, t = 1421

and 1624 coins in all

check:

1624 - 145 - 5/7 (1421)

= 1624 - 145 - 1015

= 464

464 is 2/7 of 1624

- math -
**Al**, Thursday, April 19, 2012 at 10:03pmThank you, Steve.

- math -
**Al**, Thursday, April 19, 2012 at 10:07pmThank you, Steve.

**Related Questions**

maths - Xuan Yun has a total of 24 coins in her piggy bank. Some of them are ...

Grade 5 Maths - A coin box contained some twenty-cent and fifty-cent coins in ...

maths - A coin box contained some twenty-cent and fifty-cent coins in the ratio ...

math - Fred has thirteen coins. Together they're worth $1.65. One of them ia a ...

Math problem I need help with - Combination of coins that can be used; fifty-...

PHYSICS - In a physics lab experiment, a student immersed 205 one-cent coins (...

Physics help please - In a physics lab experiment, a student immersed 205 one-...

algebra - How many coins When i dumped the change out of my pocket, I noticed ...

PHysics-almost complete! - In a physics lab experiment, a student immersed 205 ...

Physics, almost have it! - In a physics lab experiment, a student immersed 205 ...