In the following figure, ^@ AD = AB, ^@ ^@ \angle DAB = \angle DCB = \angle AEC = 90^\circ ^@ and ^@ AE = 15 \space cm. ^@ Find the area of the quadrilateral ^@ ABCD. ^@
Thomas can do a piece of work in ^@ 48 ^@ days. He works at it for ^@ 12 ^@ days and then Marie alone finishes the work in ^@ 30 ^@ days. In how many days they together could have completed the work^@?^@
For the school assembly, the students are made to stand so that the number of rows is equal to the number of students in each row. If there are 69 rows, how many students were present at the assembly?
Maxence draws ^@4^@ cards out of a deck of ^@52^@ cards. What is the probability that he draws ^@a \space King, \space a \space 2, \space a \space 10, \space and \space a \space 7^@?