Muffins are sold in Nora Bread Shop at the prices as shown:
1 banana muffin $2.40
1 vanilla muffin $1.20
MrsNg bought 7 more vanilla muffins than banana muffins from this bread shop. She paid $30 in total. How many muffins did Mrs Ng buy altogether?
|
Banana muffins |
Vanilla muffins |
Total muffins |
Number |
1 u |
1 u + 7 |
|
Value |
2.40 |
1.20 |
|
Total value |
2.4 u |
1.2 u + 8.4 |
3.6 u + 8.4 |
Amount that Mrs Ng paid for banana muffins
= 1 u x 2.40
= 2.4 u
Amount that Mrs Ng paid for vanilla muffins
= 1.20 x (1 u + 7)
= 1.2 u + 8.4
Total amount that Mrs Ng paid
= 2.4 u + 1.2 u + 8.4
= 3.6 u + 8.4
3.6 u + 8.4= 30
3.6 u = 30 - 8.4
3.6 u = 21.6
1 u = 21.6 ÷ 3.6 = 6
Number of muffins that Mrs Ng bought altogether
= 2 u + 7
= 2 x 6 + 7
= 12 + 7
= 19
Answer(s): 19