Buns are sold in Penelope Cake Shop at the prices as shown:
1 vanilla bun $2.80
1 apple bun $1.90
MrsChye bought 7 more apple buns than vanilla buns from this cake shop. She paid $18 in total. How many buns did Mrs Chye buy altogether?
|
Vanilla buns |
Apple buns |
Total buns |
Number |
1 u |
1 u + 7 |
|
Value |
2.80 |
1.90 |
|
Total value |
2.8 u |
1.9 u + 13.3 |
4.7 u + 13.3 |
Amount that Mrs Chye paid for vanilla buns
= 1 u x 2.80
= 2.8 u
Amount that Mrs Chye paid for apple buns
= 1.90 x (1 u + 7)
= 1.9 u + 13.3
Total amount that Mrs Chye paid
= 2.8 u + 1.9 u + 13.3
= 4.7 u + 13.3
4.7 u + 13.3= 18
4.7 u = 18 - 13.3
4.7 u = 4.7
1 u = 4.7 ÷ 4.7 = 1
Number of buns that Mrs Chye bought altogether
= 2 u + 7
= 2 x 1 + 7
= 2 + 7
= 9
Answer(s): 9