Basic Numeracy — Prelims Questions

A sum of money doubles itself at simple interest in 8 years. In how many years will it become four times itself at the same rate?

A student has to secure 40% marks to pass. He gets 178 marks and fails by 22 marks. The maximum marks are:

A, B, and C can complete a piece of work in 10, 12, and 15 days respectively. If A, B, and C start working together, but A leaves after 2 days, and B leaves 3 days before the completion of the work, in how many days is the work completed?

A train passes a platform 120 meters long in 15 seconds and a man standing on the platform in 10 seconds. The speed of the train is:

The average age of 30 students and a teacher is 15 years. If the teacher's age is excluded, the average age of the students becomes 14 years. What is the teacher's age?