A jar contains red and blue marbles in the ratio ^@ 1 : 5. ^@ When Iqbal replaces ^@ 3 ^@ of the blue marbles with ^@ 7 ^@ red marbles, the ratio becomes ^@ 6 : 11. ^@ What is the ratio of the total number of marbles in the jar after replacement to the total number of marbles in the jar originally?
Ismail had some boxes of pencils (each box contains 13 pencils). He gave away 16 pencils to his friend Akshiti. If a is the number of boxes Ismail originally had, how many pencils are left with Ismail?
ABCD is a rectangle. The radius of one full circle and 2 quarter-circles shown in the figure is 2.8 m. Find the area of the shaded region. (All dimensions are in m and assume π = 22/7)