The mean of 20 items is 55. If two items 45 and 30 are removed, what will be the new mean of the remaining items?

If the circumradius of an equilateral triangle ABC is 8 cm, then what is the height of the triangle?

A works 7 hours a day at the rate of 180 per hour. B works 5 hours a day at the rate of 160 per hour. What is the ratio of daily earnings of A and B?

The two vowels touch each other internally. Their radii are 2 cm and 3 cm. What will be the length of the largest chord of the bigger circle outside the inner circle?

If the price of tickets is increased in the ratio 8 : 11 then the number of tickets sold falls in the ratio 23 : 21 then what is the increase in the revenue, if the revenue before the increase in the price of the ticket was Rs 36,800 ?

A can do 50% of a work in 16 days, B can do 1/4 of the same work in 24 days. In how many days will they complete 3/4th of the work working together?

What is a point at equidistant from the vertices of a triangle called?

If in a triangle the circumcentre, incentre, centroid and orthocentre are at the same place, then what will that triangle be like?