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Yes
No, any operation can be done to them.
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
multiply
To find the total number in 4 groups of 19, you would multiply the number of groups (4) by the number in each group (19). This calculation would be 4 x 19 = 76. Therefore, there are 76 in 4 groups of 19.