Usha baked a total of 340 shortbreads and scones. After giving away 90% of the scones and 80% of the shortbreads, she was left with four times as many scones as shortbreads. Find the number of shortbreads Usha gave away.
| |
Scones |
Shortbreads |
| Before |
10x4 =
40 u
|
5 u |
| Change |
- 9x4 =
36 u |
- 4 u |
| After |
1x4 =
4 u |
1 u |
Comparing scones and
shortbreads in the end |
4x1 =
4 u |
1x1 =
1 u |
90% =
90100 =
91080% =
80100 =
45The number of scones in the end is the repeated identity. Make the number of scones in the end the same. LCM of 1 and 4 is 4.
Total number of pastries at first
= 40 u + 5 u
= 45 u
45 u = 340
1 u = 340 ÷ 45 = 7
Number of shortbreads that Usha gave away
= 4 u
= 4 x 7
= 28
Answer(s): 28
