Question

Ravi asked his neighbor to water a delicate plant while he is away. without water, the plant would die with probability 4/5 and with water it would die with probability 3/20. the probability that ravi's neighbor would remember to water the plant is 9/10. if the plant actually died, what is the probability that ravi's neighbor forgot to water the plant?

Answer 1

the answer can be
1/10
or
2/20