Solution:
Total Number of marbles in the Bag = 10 red, + 12 green,+ 15 blue,+ 8 red, +12 white, + 7 black= 64 marbles
→Probability of an event =
→Probability of choosing a Red Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
→Probability of choosing a Green Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
→Probability of choosing a Blue Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
→Probability of choosing a red of another kind(r) Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
→Probability of choosing a White Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
→Probability of choosing a Black Marble from (64 marble=10 R + 12 G + 15 B+8 r + 12 W + 7 B)=
Answer:
75 quarters 25 nickels
Step-by-step explanation:
q=quarters n=nickels
q+n=100 n=100-q
0.25q +0.05(100-q)=20
From now I will multiply by 100 to avoid decimals
25q + 5(100-q)=2000
20q=1500
q=75 n=25
75*0.25= 18.75
25*0.05=1.25
18.75+1.25=20
I assume you're looking for the number:
0.5n + 9 = 21
- 9
0.5n = 12
÷ 0.5
n = 24
So the beginning number is 24, hope this helps!