Muffins are sold in Dana Bread Shop at the prices as shown:
1 blueberry muffin $1.80
1 chocolate chip muffin $1.20
MrsPang bought 10 more chocolate chip muffins than blueberry muffins from this bread shop. She paid $21 in total. How many muffins did Mrs Pang buy altogether?
|
Blueberry muffins |
Chocolate chip muffins |
Total muffins |
Number |
1 u |
1 u + 10 |
|
Value |
1.80 |
1.20 |
|
Total value |
1.8 u |
1.2 u + 12 |
3 u + 12 |
Amount that Mrs Pang paid for blueberry muffins
= 1 u x 1.80
= 1.8 u
Amount that Mrs Pang paid for chocolate chip muffins
= 1.20 x (1 u + 10)
= 1.2 u + 12
Total amount that Mrs Pang paid
= 1.8 u + 1.2 u + 12
= 3 u + 12
3 u + 12= 21
3 u = 21 - 12
3 u = 9
1 u = 9 ÷ 3 = 3
Number of muffins that Mrs Pang bought altogether
= 2 u + 10
= 2 x 3 + 10
= 6 + 10
= 16
Answer(s): 16