Sam has been to a Halloween party and has come home with a loot bucket full of treats!
The bucket contains 10 sweet treats.
Some of the treats are chocolate bars and some are bags of jelly sweets.
If a treat is selected at random, the probability of selecting a chocolate bar is 2/5.
Sam’s brother gives him 10 more bags of jelly sweets to add to his loot bucket.
He now selects one treat at random.
What is the probability that the treat Sam selects is a chocolate bar?
Answer:
If the probability of selecting a bar of chocolate is 2/5 from 10 treats, then
10 x 0.4 = 4 means there are 4 chocolate bars in the bag.
If 10 extra bags of jelly sweets are added it means the probability of getting a chocolate bar is 4/20.
4/20 = 0.2 or 1/5.