Solve the equation. 7.7 = a - 4

a = 8.1

a = 1.925

a = 7.3

a = 11.7

Can someone me with this problem i don't understand i need

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

How many doughnuts are equal to 20 cookies.? 3 apples = 5 bananas6 cookies = 7 apples2 doughnuts = 1 banana