What are some ratios that are equivalent to 5/7

If 1 km = 0.621 miles, how many miles are in a centimeter

Find the balance at the end of 4 years if 1000 is deposited at the rate of

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 ?