Mrs Seah baked 7 biscuits more than swiss rows. Each biscuit needed 0.07 kg of flour while each pie needed 0.4 kg of flour. She used 2.15 kg more flour for the swiss rows than for the biscuits. How many biscuits did Mrs Seah bake?
| |
Swiss Rows |
Biscuits |
Difference |
| Number |
1 u |
1 u + 7 |
|
| Value |
0.4 |
0.07 |
|
| Total value |
0.4 u |
0.07 u + 0.49 |
0.33 u - 0.49 |
Amount of flour needed for biscuits
= 0.07 x (1 u + 7)
= 0.07 u + 0.49
Amount of more flour for the swiss rows than the biscuits
= 0.4 u - (0.07 u + 0.49)
= 0.4 u - 0.07 u - 0.49
= 0.33 u - 0.49
0.33 u - 0.49 = 2.15
0.33 u = 2.15 + 0.49
0.33 u = 2.64
1 u = 2.64 ÷ 0.33 = 8
Number of biscuits baked
= 1 u + 7
= 8 + 7
= 15
Answer(s): 15
