Which two ratios form a proportion?
a) 1/2
and
4/2
b)
2/1
and
4/8
c)
1/2
and
8/4
d)
2/1
and
16/8

Pls! does anybody know a shortcut for answering these types of questions in the future?

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. after tax the total is 45.99. what percentage of the subtotal is the total?