2. 400 x 70% =
400 x 0.7 = 280
3. ?% x 40 = 28
= 28/40
= 0.7
= 70%
4. 24 x 25% =
24 x 0.25 = 6
24+6=30
5. 75% x 48 =
0.75 x 48 = 36
6. 13% x ? = 1,440
= 1,440/0.13
= $ 11,076.92
7. 20% x 456 =
0.20 x 456= 91.20
8. 75% x ? =15
= 15/0.75
= 20
9. 80% x ? = 12,500
= 12,500 / 0.80
= 15, 625.00
10. 72/ 90 = 0.75
=75%
Ejercicio#2 Razon
1. 20:25 20/25 = 4/5
2. 12:4 12/4 = 6/2
3. 10:8 10/8 = 5/4
4. 3 1/5 / 6 = 3 1/5 / 6 = 16/5 x 1/6 = 16/30
- 6:3 6/3
- 6:9 6/9= 2/3
- 3:9 3/9 = 1/3
5. 32:8 32/8 = 8/2
6. 128:16 128/16 = 16/2
Ejercicio # 3 Proporcion
1. x/20 = 3/5
5x = 20x3
5x = 160/5
x = 12
2. 12/x = 9/8
9x = 12x18
= 216/18
= 12
3. 5/3 = x/6
3x = 5x6
3x = 30
x= 30/3
x= 10
4. 5:11 = 15:x 5/11=15/x
5x = 15x11
5x = 165
x = 165/5
x = 33
5. x:3 = 4:6 x/4 = 4/6
6x = 4x3
6x = 12
x = 12/6
x = 2
6. 50/3 = x/75
3x = 50x75
3x= 3,750
x= 3,750/3
x= 1,250
7. 33/ 1 = x / 85
x= 33x85
= 2,805
8. 16/x = 2.5/ 300
2.5x= 16x300
x= 4,800/2.5
x= 1,920
9. 118/x = 2/24
2x= 118x24
x = 2,833/2
x= 1,416
Actividad#1 Razones
1. 20/28 = 10/16
2. 9/36 = 3/12
3. 15 pulgadas/3 pies = 15 pulgadas/36 pulgadas = 5/12
4. 40cm/ 3m = 40cm/300cm= 20/150 = 2/15
5. 240millas/8galones = 30/1galones
6. 220galones/20minutos = 11galones/1minuto
Activudad #2 Proporcion
1. 83/41 = 74/43 = NO
2: 125/45 = 25/9 = SI
3. 9/4 = 27/12 = 9x12 = 108
= 27x4 = 108
4. x/18 = 7/9
9x = 18x7
9x/9 = 126/9
= 14
5. 3/x = 8/64
8x = 3x64
8x/x = 192/8
= 24
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