Answer:
$1,050 in interest
Step-by-step explanation:
recall that the formula to find simple interest is as follows:
I = Prt, where
I = Interest (we are asked to find this)
P = principal amount = given as $7000
r = interest rate = 5% = 0.05
t = time = 3 years
Substituting the known values into the equation,
I = Prt
= (7000)(0.05)(3)
= $1,050 in interest
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Answer:
girls = 61
boys = 73
Step-by-step explanation:
Let x = number of girls
Let y = number of boys
Given the difference between the number of the girls and the number of the boys in the outdoors club is 12:
⇒ y - x = 12
Given there are 4 times the number of the girls decreased by 25 equals 3 times the number of the boys:
⇒ 4x - 25 = 3y
Rearrange x - y = 12 to make y the subject:
⇒ y = 12 + x
Substitute x = 12 + y into 4x - 25 = 3y and solve for y:
⇒ 4x- 25 = 3(12 + x)
⇒ 4x- 25 = 36 + 3x
⇒ x = 61
Now we have found the value of x, substitute this into y = 12 + x and solve for y:
⇒ y = 12 + 61
⇒ y = 73
