Let X represent the number of pennies.
Let Y represent the number of nickels.
We know that X + 5Y = (Y + 5X) + 80.
4Y = 4X + 80
Y = X + 20
Hence, the difference between the number of pennies and the number of nickels is 20.
Answer:
equation has no solutions
Step-by-step explanation:
4p - 6= 3 +4p (subtract 4p from both sides)
-6 = 3
As you can see, -6 is obviously not equal to 3, hence we can conclude that the equation has no solutions.
Answer:
25 mL
Step-by-step explanation:
You subtract the amount of water in the cylinder with the rock, from the amount of water in the cylinder without the rock. The equation is 75mL - 50 mL