2970: A person should practice Yoga if...

[mattmurdockdd9]

Hello. I am trying to figure out when to use if vs only if in the premise. The problem stated:

(p) A person should practice yoga only if he or she has at least 20 minutes a day to devote complete attention to the practice.
(p) A person should practice yoga if he or she has at least 20 minutes a day to devote complete attention to the practice.

(A) Most members of congress have at least 20 minutes a day to devote their complete attention to the practice of yog

(C) Most members of congress should practice yoga

Any clarity is appreciated. Thanks!

[ohthatpatrick]

"If X then Y" looks like
X --> Y

"Only if X then Y" looks like
Y --> X

(You can probably hear the difference between saying "If you play in the NFL, you're a male" vs. "Only if you play in the NFL are you a male")

Try to memorize that
"if" = put this on left side
"only if" = put this on right side

(p) A person should practice yoga only if he or she has at least 20 minutes a day to devote complete attention to the practice.

is should practice yoga --> has at least 20 mins

(p) A person should practice yoga if he or she has at least 20 minutes a day to devote complete attention to the practice.

is has at least 20 mins --> should practice yoga

You always wanna see your premise on the left and your conclusion on the right. Since we're trying to conclude members of Congress should practice yoga, we need the "if" version of the rule.

Hope this helps.