Muffins are sold in Gillian Pastry Shop at the prices as shown:
1 cranberry muffin $2.90
1 blueberry muffin $1.30
MrsLu bought 4 more blueberry muffins than cranberry muffins from this pastry shop. She paid $22 in total. How many muffins did Mrs Lu buy altogether?
|
Cranberry muffins |
Blueberry muffins |
Total muffins |
Number |
1 u |
1 u + 4 |
|
Value |
2.90 |
1.30 |
|
Total value |
2.9 u |
1.3 u + 5.2 |
4.2 u + 5.2 |
Amount that Mrs Lu paid for cranberry muffins
= 1 u x 2.90
= 2.9 u
Amount that Mrs Lu paid for blueberry muffins
= 1.30 x (1 u + 4)
= 1.3 u + 5.2
Total amount that Mrs Lu paid
= 2.9 u + 1.3 u + 5.2
= 4.2 u + 5.2
4.2 u + 5.2= 22
4.2 u = 22 - 5.2
4.2 u = 16.8
1 u = 16.8 ÷ 4.2 = 4
Number of muffins that Mrs Lu bought altogether
= 2 u + 4
= 2 x 4 + 4
= 8 + 4
= 12
Answer(s): 12