2. The scale is 3 inches = 2 feet.
Divide total inches by 3, then multiply by 2:
30 / 3 = 10
10*2 = 20 feet.
3. Divide the 9cm by 3cm, then multiply by 8 km
9/3 = 3
3*8 = 24 kilometers.
4. Divide real distance by distance on map:
36 / 4 = 9
1 inch = 9 miles
5. Divide real dimension by the drawing dimension:
21 meters / 3 centimeters = 7
1 cm = 7 meters
Let, the numbers = x,y
x/y = 3/5
total ratio units = 3+5 = 8
value of 1 unit = 135/8 = 16.875
So, numbers would be 3(16.875) & 5(16.875) = 50.625 & 84.375
so, your answer is 50.625 & 84.375
Solve for x by cross multiplying then isolating the variable:

cross multiply
15x=90 Isolate the variable
x=6
Solve for y by cross multiplying then isolating the variable:

cross multiply
9y=90 Isolate the variable
y=10
Total number of marbles:
75 + 50 + 100 + 25 =
250
Probability of selecting a red marble:
25/250 (since 25 out of 250 marbles are red)
Since the top and bottom of this fraction are both divisible by 25, we can go ahead and divide them both by 25, simplifying to
1/10.
Probability of selecting a green marble:
50/250
Simplifies to 2/10
Simplifies to
1/5.
Probability of selecting a blue or orange marble
(75+100)/250
175/250
Simplifies to
7/10.
To find the probability that each event occurs in order, simply multiply them all together.