Muffins are sold in Sabrina Confectionery at the prices as shown:
1 chocolate chip muffin $2.80
1 cherry muffin $2.10
MrsPeh bought 3 more cherry muffins than chocolate chip muffins from this confectionery. She paid $21 in total. How many muffins did Mrs Peh buy altogether?
|
Chocolate chip muffins |
Cherry muffins |
Total muffins |
Number |
1 u |
1 u + 3 |
|
Value |
2.80 |
2.10 |
|
Total value |
2.8 u |
2.1 u + 6.3 |
4.9 u + 6.3 |
Amount that Mrs Peh paid for chocolate chip muffins
= 1 u x 2.80
= 2.8 u
Amount that Mrs Peh paid for cherry muffins
= 2.10 x (1 u + 3)
= 2.1 u + 6.3
Total amount that Mrs Peh paid
= 2.8 u + 2.1 u + 6.3
= 4.9 u + 6.3
4.9 u + 6.3= 21
4.9 u = 21 - 6.3
4.9 u = 14.7
1 u = 14.7 ÷ 4.9 = 3
Number of muffins that Mrs Peh bought altogether
= 2 u + 3
= 2 x 3 + 3
= 6 + 3
= 9
Answer(s): 9