Sally has 12 coins consisting of quarters and dimes. The value adds to $2.25, how many of each coin does she have?

Question

anonymous · Answer

let x be quarters and y be dimes.
so x + y = 0.35
agreed?

anonymous · Answer

Where did 35 cent come from ?

anonymous · Answer

a quarter is 0.25 $
and a dime is 0.10$

anonymous · Answer

ok , ok .

anonymous · Answer

agreed.

anonymous · Answer

lol, sorry, ignore that

  0.25x + 0.10(12-x) = 2.25¢

anonymous · Answer

so , when I multiply .10 by 12 would I get 1.2x ?

anonymous · Answer

yes
or yu can have 25x+10(12-x)=225

anonymous · Answer

will x = 1.6 ?

anonymous · Answer

0.25x + 0.10(12-x) = 2.25¢
0.25x+1.2-0.1x =  2.25
o.15x = 1.05
x=7
so there's 7 quarters

anonymous · Answer

and 5 dimes ?

anonymous · Answer

yea
so let's check it
remember i said at first one quarter plus one dime =0.35
so what is (7*0.25) + (5*0.10)

anonymous · Answer

7*0.25= 1.75 and 0.10*5=.50 1.75+.50 = 2.25