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?
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
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.