Please help me I don’t understand this stuff lol
A) 5/3
B) 5/4
C)10/3
D)4/3

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

If 20% of a number is 35, what is 50% of that number?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9