If the ratio of purple marbles to orange marbles is 3 to 8, how many orange marbles will I have if I have 48 purple marbles?

You will have 18 orange marbles

Step-by-step explanation:

Set this up as an equation

Variable x = number of orange marbles

3/8 = x/48

Cross multiply

3 × 48 = 8 × x

144 = 8x

Divide both sides by 8 to isolate the variable

144 ÷ 8 = 8x ÷ 8

18 = 1x

18 = x

18 orange marbles

Check work:

Substitute the variable x for the answer

3/8 = 18/48

Cross multiply

3 × 48 = 18 × 8

144 = 144

If the numbers equal, the answer is correct

Step-by-step explanation:

128 marbles

First you divide 48 by 3 and u get 16. Then u multiply 16 by 8.

To prove just simplify

3/8=48/128

3/8=3/8

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116