Muffins are sold in Anna Bread Shop at the prices as shown:
1 cheese muffin $1.80
1 apple muffin $1.60
MrsKong bought 4 more apple muffins than cheese muffins from this bread shop. She paid $20 in total. How many muffins did Mrs Kong buy altogether?
|
Cheese muffins |
Apple muffins |
Total muffins |
Number |
1 u |
1 u + 4 |
|
Value |
1.80 |
1.60 |
|
Total value |
1.8 u |
1.6 u + 6.4 |
3.4 u + 6.4 |
Amount that Mrs Kong paid for cheese muffins
= 1 u x 1.80
= 1.8 u
Amount that Mrs Kong paid for apple muffins
= 1.60 x (1 u + 4)
= 1.6 u + 6.4
Total amount that Mrs Kong paid
= 1.8 u + 1.6 u + 6.4
= 3.4 u + 6.4
3.4 u + 6.4= 20
3.4 u = 20 - 6.4
3.4 u = 13.6
1 u = 13.6 ÷ 3.4 = 4
Number of muffins that Mrs Kong bought altogether
= 2 u + 4
= 2 x 4 + 4
= 8 + 4
= 12
Answer(s): 12