A bicycle store cost $3200 per month to operate. The store pays an average of $40 per bike. The average selling price of each bicycle is $120. How many bicycles must the stores sell each month to break even

40 bicycles

Step-by-step explanation:

Here it the equation to solve this:  3200= (120-40)b

3200 is the cost to operate, the 120 is how much they sell a bike for, 40 is how much the store pays for a bike, and b is how many bikes they need to sell to break even. Plug in the numbers and solve.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons