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A cookie costs m cents and a slice of cake costs 70 cents more than a

cookie.

(a)      What is the cost of 2 slices of cake and 4 cookies in cents?

(b)      Alison wants to buy 3 slices of cake and 2 cookies but is short of

           25 cents. If each cookies costs 80 cents, how much money does

           Alison have?

 Oct 1, 2021
 #1
avatar+35058 
+2

cookie = m cents

cake = cookie + 70    =   m+70

a)

2 *cake + 4* cookie

= 2* (m+70)   + 4*m

= 6m+140

 

b)   m = 80     so  cookie = 80 cents     and cake = m+70 = 80 + 70 = 150 cents

    3 * cake   + 2*cookies

    3* 150     + 2 * 80 = 610 cents

       If Alison is 25 cents short   she has   610 - 25 =  585 cents

 Oct 1, 2021
 #2
avatar+83 
+1

Cookie =m
Cake= m+70 cents

4 cookies =4 m
2 cake = 2m+140 cents
Total= (6m + 140) cents

3 cake = 3m + 210
2 cookies = 2m
Total = 5m + 210
If m=80 cents, 
Therefore total = 5x80 +210 =610.
Alison have 610 - 25 = 585 cents.

 Oct 1, 2021

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