Question 1189503
let s = no. of coins Sammy has
"Aly had 7 times as many 25-centavo coins as Sammy has."
therefore
 7s = no. of coins Aly has
:
sammy and ally had a total of 448 pieces of 25-centavo coins.
 s + 7s = 448
 8s = 448
 s = 56 coins Sammy has
and
 a = 7*56
 a = 392 coins Aly has
: 
 How many 25- centavo coins should Ally give to Sammy so that Sammy would have 3 time as many coins as Ally has?
Let c = no. of coins A gives S to accomplish this
 56 + c = 3(392 - c)
 56 + c = 1176 - 3c
 c + 3c = 1176 - 56
4c = 1120
c = 1120/4
c = 280 coins A gives to S
:
:
Check this, find how many coins each has after this is done
56 + 280 = 336 coins
392 - 280 = 112 coins
3 * 112 = 336