Linda made 175 biscuits and cookies. After she gave 0.7 of the biscuits and 0.8 of the cookies to her students, she was left with an equal number of biscuits and cookies. How many biscuits had she left?
| |
Biscuits |
Cookies |
Before
|
10x1 =
10 u |
5x3 =
15 u |
Change
|
- 7x1 =
- 7 u |
- 4x3 =
- 12 u |
After
|
3x1 =
3 u |
1x3 =
3 u |
Comparing biscuits and
cookies in the end |
1x3 =
3 u |
1x3 =
3 u |
0.7 =
710 0.8 =
810 =
45 The number of biscuits and cookies is the same in the end. Make the number of biscuits and cookies in the end the same. LCM of 3 and 1 and 1 is 3.
Total number of biscuits and cookies at first
= 10 u + 15 u
= 25 u
25 u = 175
1 u = 175 ÷ 25 = 7
Number of biscuits that Linda had left
= 3 u
= 3 x 7
= 21
Answer(s): 21
