The average age of 30 boys in a class is 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose age differs by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger newcomer is: 

Some amount out of Rs.7000 was lent at 6% per annum and the remaining at 4% per annum. If the total simple interest from both the fractions in 5 year was Rs.1600, find the sum lent at 6% per annum.

Directions:Study the following table carefully to answer these questions:

Percentage of Marks obtained by six students in six subjects

What are the total marks obtained by ‘B’ in all the subjects together ?

Find the average of the following sets of numbers.

693, 456, 876, 532, 934, 691, 596, 398, 682

What are the roots of the quadratic equations?

  $$(x^2 + 3x - 154 = 0)$$

What is the effective discount for every 4 consecutive discounts of 20%?

If the difference between the roots of the equation Ax²+BX+C = 0 is 4, then which of the following is TRUE?

What approximate value will come in place of the question mark (?) in the following questions?

324.995 x 15.98 ÷ 4.002 + 36.88 =?