Answer:
25
Step-by-step explanation:
To convert from inches per second to feet per minute you've to multiply the value by 5.
So 5x5 = 25 feet per minute.
That's the simplest way to do it, if you want to know the advanced one i can explain it for you.
So basically you add up the ratio and get 16 because 7+9.
Now you do 48 divided by 16 which is 3 to get one price. Since Alf is divided by 7 you multiply 3 with 7. So the answer would be £21
Answer:
Step-by-step explanation:
Let
x------> the number of nickels
y-----> the number of dimes
we know that
Multiply by 100 both sides
------> equation A
------> equation B
substitute equation B in equation A
8x + 4y = -20
4y = -20 - 8x
y = -5 -2x
-4x - 8y = -20
-4x - 8(-5-2x) = -20
-4x + 40 + 16x = -20
12x = -60
x = -5
8(-5) + 4y = -20
-40 + 4y = -20
4y = 20
y = 5