the total cost of lunch was $5.40, the cookie was 1/3 the cost of the salad and the drink cost twice as much as the cookies, how much did each thing cost?
2006-11-06 12:17:06 · 9 answers · asked by Anonymous in Education & Reference ➔ Homework Help
Given facts: salad = 3* cookies (s=3c)
Drink = 2* cookies (d=2c)
total cost was $5.40
assume the cookie was the base of the meal.
1 cookie = c
1 salad = 3c
1 drink = 2c
c+3c+2c=$5.40
6c=$5.40
c= $.90
cookie = $.90
salad = 3* $.90 = $2.70
drink = 2* $.90 = $1.80
to check the answers, add the totals: $2.70+$1.80+$.90 =$5.40
2006-11-06 12:30:24 · answer #1 · answered by Roosterkroozer 4 · 2⤊ 0⤋
Word problems are all about picking out the facts and the unknowns and writing it out as an equation...
Let the cost of the salad = X
okay -- your sentence says the cookie was 1/3 the cost of the salad... how would you represent that? Remember - we called the cost of the salad X... so that's 1/3 x
cost of cookie = 1/3x
"the cost of the drink cost twice as much as the cookies"... you know the term that represents the cost of the cookies so how do you express the cost of the drink? It's TWICE as much...
you know the total. If you add each thing - the salad plus the cookie plus the drink you'll get 5.40
What symbol do you use when you see the word plus??
Now put it all together and solve for X, then you can figure out what each thing cost because X is the cost of the salad and you know how the cost of the salad relates to the cost of the cookies and how the cost of the cookies relates to the cost of the drink.
2006-11-06 12:26:11 · answer #2 · answered by Anonymous · 0⤊ 2⤋
let salad cost=x
then cookie cost=x/3 because you do 1/3 times salad cost
then drink cost=2x/3 ' cos it's twice as much as the cookies
altogether their sum is 5.40
x +x/3 +2x/3=5.40
2x =5.40
x =2.70
initially we said salad cost= x,
thus salad cost = 2.70
cookies cost= x/3= 2.70=90 cent
drink cost= 2x/3 = 2* 90 cent=1.80
2006-11-06 12:33:32 · answer #3 · answered by jasmine 3 · 0⤊ 2⤋
L = 5.40
L = C + S + D
C = (1/3)*S
D = 2*C
Put the Drink and the Cookie in terms of the Salad; then you have one equation and one unknow (the Salad).
Solve for S, then C, then finally D.
2006-11-06 12:23:20 · answer #4 · answered by ZenPenguin 7 · 2⤊ 1⤋
i would try an equation
cookies=1/3s
salad=s
drink=2*(1/3)s=2/3s
add them up
1/3s+s+2/3s=5.40
2s=5.40
s=2.70, so the salad was 2.70
the cookies (1/3)*2.70=.90
drink=(2/3)*2.7=1.80
2006-11-06 12:22:41 · answer #5 · answered by travislizzie 2 · 2⤊ 2⤋
ooo~~! math... XD
alright: start with statements.
cookie= 1/3x
salad=x
drink=2(1/3x)
total=5.40
write an equation:
1/3x+x+2(1/3x)=5.40
1(1/3)x+2/3x=5.40
3x=5.40
(hope you get it) divide
x=1.80
go back to the statements.
salad=x=$1.80
cookies=1.3x=$.60
drink=2(1/3x)=$1.20
there's your answer!
2006-11-06 12:28:37 · answer #6 · answered by stella646 2 · 0⤊ 2⤋
A few bucks in food stamps
2006-11-06 12:19:58 · answer #7 · answered by Anonymous · 2⤊ 1⤋
sry hate math
2006-11-06 12:20:18 · answer #8 · answered by *~Love?~* 3 · 1⤊ 2⤋
like who cares as long as you eat, right
2006-11-06 12:27:45 · answer #9 · answered by Anonymous · 0⤊ 2⤋