Frank has three times as many dollars as Deandra, and Charlie has 20 more dollars than Frank. If Charlie has $65, how much money does Deandra have? Let f represent the amount of money Frank has in dollars, and let d represent the amount of money Deandra has in dollar

$15

Step-by-step explanation:

Let Frank be f

Deandra be d and

Charlie be c

f = 3d (i)

c=$20+f(ii)

c=$65(iii)

Equate (ii) and (iii)

$20+f = $65

f = $45(iv)

Equate (i) and (iv)

3d = $45

d = $15

Deandra has $15.

the amount of money that Deandra has is $15

Step-by-step explanation:

Let f represent the amount of money Frank has in dollars.

let d represent the amount of money Deandra has in dollar.

Frank has three times as many dollars as Deandra. This means that

f = 3d

Charlie has 20 more dollars than Frank. If Charlie has $65, it means that the amount that Frank has is

65 - 20 = $45

Substituting f = 45 into f = 3d, it becomes

45 = 3d

d = 45/3

d = 15

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.