Esther baked a total of 205 tarts and biscuits. After giving away 90% of the biscuits and 75% of the tarts, she was left with four times as many biscuits as tarts. Find the number of tarts Esther gave away.
| |
Biscuits |
Tarts |
| Before |
10x4 =
40 u
|
4 u |
| Change |
- 9x4 =
36 u |
- 3 u |
| After |
1x4 =
4 u |
1 u |
Comparing biscuits and
tarts in the end |
4x1 =
4 u |
1x1 =
1 u |
90% =
90100 =
91075% =
75100 =
34The number of biscuits in the end is the repeated identity. Make the number of biscuits in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 40 u + 4 u
= 44 u
44 u = 205
1 u = 205 ÷ 44 = 7
Number of tarts that Esther gave away
= 3 u
= 3 x 7
= 21
Answer(s): 21
