pp-T1-DS149

[Huang Hsin-Yi]

149.
If m, r, x, and y are positive, is the ratio of m to r equal to the ratio of x to y ?

(1) The ratio of m to y is equal to the ratio of x to r.

(2) The ratio of m + x to r + y is equal to the ratio of x to y.

ANS:B

[puja]

149.
If m, r, x, and y are positive, is the ratio of m to r equal to the ratio of x to y ?

(1) The ratio of m to y is equal to the ratio of x to r.

(2) The ratio of m + x to r + y is equal to the ratio of x to y.

ANS:B

利用它給的比例去算:
問 m:r =x:y------>rx=my??

1) m:y =x:r------->xy=mr 不充分

2) m+x:r+y = x:y----->rx+xy= my+xy (x,y皆為正數,xy對消)
故 rx=my-----充分

[Huang Hsin-Yi]

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