A, B and C can complete a work in 20, 24 and 30 days respectively. All three of them starts together but after 4 days A leaves the job and B left the job 6days before the work was completed. C completed the remaining work alone. In how many days was the total work completed?
Which vaccine company has developed Typbar Typhoid Conjugate vaccine that has received pre – qualification from the World Health Organisation (WHO)for global use ?