1.in a proportion, the product of the mean equals the product of the____________.
A.ratio
B.terms
C.external
D.extremes
2.when two ratios are equal, we call it a________.
A.ratio
B.proportion
C.ratio and proportion
D.fraction
3.the ratio of my father's weight to my mother's weight is 5:15. What is the simplest ratio of my mother's weight to my father's weight?
A.1:3
B.4:5
C.2:7
D.6:7
4.when the other quantity increase the other quantity also increases. This shows_____.
A.direct quantity
B.indirect quantity
C.indirect proportion
D.direct proportion