Mary wraps 5 parcels in 2 minutes while Kerry unwraps a parcel every ten minutes. If both work together how long will it take them to have 120 wrapped parcels ready?
A) 5 mins
B) 10 mins
C) 20 mins
D) 35 mins
E) 50 mins
Mary wraps 5 parcels in 2 minutes while Kerry unwraps a parcel every ten minutes. If both work together how long will it take them to have 120 wrapped parcels ready?
A) 5 mins
B) 10 mins
C) 20 mins
D) 35 mins
E) 50 mins
Hello,
let x denote the number of minutes it takes to get the 120 Parcels.
You know that Mary wraps
and Kerry unwraps
That means the number of parcels is determined by:
Hey, its ok, I got it. Thanks a lot. It was really easy. Mary does 5/2= 2.5 boxes/minute. Kerry unwraps 1/10= 0.1 per minute. So Mary - Kerry (since they're doing opposite things) is equal to 2.4. Now 2.4 * 120= 50 minutes.
Hey, its ok, I got it. Thanks a lot. It was really easy. Mary does 5/2= 2.5 boxes/minute. Kerry unwraps 1/10= 0.1 per minute. So Mary - Kerry (since they're doing opposite things) is equal to 2.4. Now 2.4 * 120= 50 minutes.
Hello,
you obviously calculated correctly but wrote it the wrong way: