Magtanong at makakuha ng eksaktong mga sagot sa IDNStudy.com. Hanapin ang impormasyon na kailangan mo nang mabilis at madali sa pamamagitan ng aming komprehensibo at eksaktong platform ng tanong at sagot.

D. Solve each problem
18 Four pencil orasers cost P12, how many erasers can
buy for P63
19. There are 4 boys to 7 girls in a class. At the same ratio
how many boys are there in 42 girls?
20. For every 3 classes in the intermediate grades, there
are 5 teachers. How many teachers are there for 15
classes?​


Sagot :

Answer:

18. 21

19. 24

20. 9

Step-by-step explanation:

18. 4:12 = x:63

12x = 63(4)

12x = 252

x = 21

19. 4:7 = x:42

7x = 42(4)

7x = 168

x = 24

20. 3:5 = x:15

5x = 15(3)

5x = 45

x = 9