Im stuck, idk how to do ratios.

21:6, 7:2, 14:4

Step-by-step explanation:

This table represents the ratios. For 21 square meters of fabric, Harry can make 6 wizard cloaks. We're trying to find a) how many cloaks we can make out of 7 square meters, and b) how many square meters is needed for 4 cloaks.

A)

Simplify the ratio by finding the LCD (Lowest Common Denominator) of 21 and 7LCD=3  *LCDs are greater than 1*21/3 and 6/3The new ratio is 7:2You can make 2 cloaks out of 7 square meters of fabric

B)

For this one, it's a little different. You're essentially working backwards.The easiest way to find this one, is finding out how many square meters of fabric are needed for 1 cloak. divide 21 by 6 to find this21/6 = 3.5You will need 3.5 square meters of fabric for 1 cloakMultiply this by 4 to find the amount of fabric needed for 4 cloaks3.5*4 = 14, 1*4 = 4your new ratio is 14:4You can make 4 cloaks out of 14 square meters of fabric. *You could also just multiply the last ratio by 2. 7:2 would be 14:4*