Garret is in the middle of a 20 minute bike ride. It takes 4 minutes for him to go a kilometer, so he'll end up going 5 kilometers. Suppose k is the number of kilometers Garret has already biked.

Which expressions match to the following meanings below? (Each meaning may match more than one expression.)

Expressions:
5(4−k)
5−k
20−4k
4(5-k)
4k

Meanings:
1. Number of minutes Garret has already biked.
2. Number of minutes remaining in Garret's ride.
3. Number of kilometers Garret has left to ride.
4. None of these.

Question

Garret is in the middle of a 20 minute bike ride. It takes 4 minutes for him to go a kilometer, so he'll end up going 5 kilometers. Suppose k is the number of kilometers Garret has already biked.

Which expressions match to the following meanings below? (Each meaning may match more than one expression.)

Expressions:
5(4−k)
5−k
20−4k
4(5-k)
 4k

Meanings:
1. Number of minutes Garret has already biked.
2. Number of minutes remaining in Garret's ride.
3. Number of kilometers Garret has left to ride.
4. None of these.

theviper · Answer

To know the answer of this type of ques u should focus on meanings rather than equations :D it will make it damn easier ;)

theviper · Answer

Like this :-
1. Number of minutes Garret has already biked.
Ans: According to ques Garret has biked $k$ kilometres & it takes $4$ min to ride 1 km
        than to ride $k$ km it will take him $4k$ minutes to ride. 

So, 5th expression matches the first expression.