Two tankers contain 399 litres and 217 litres of petrol respectively. A container with maximum capacity is used which can measure the petrol of either tanker in exact number of litres. How many containers of petrol are there in the first tanker.
Rehab is 6 years older than her friend Arwa. Rehab's father is twice as old as Rehab and Arwa is twice as old has her brother. The age of Rehab's father is 33 years more than the age of Arwa's brother. Find the ages of Rehab and Arwa.
The areas of two similar triangles are ^@ 64\space cm^2^@ and ^@4\space cm^2^@ respectively. If the altitude of the bigger triangle is ^@4.8 \space cm^@, find the corresponding altitude of the smaller triangle.
Two concentric circles are of radii ^@ 7 \space cm ^@ and ^@ r \space cm ^@ ^@ ( r > 7 ) ^@.A chord of the larger circle of length ^@ 43 \space cm ^@, touches the smaller circle. What is the value of ^@ r ^@ ?
A decorative is in the form of a hollow hemisphere mounted by a hollow cylinder. The diameter of the hemisphere is 19 cm and the total height of the decorative is 54 cm, then choose the correct inner surface area of the decorative.
There are a total of 16 chocolates - 4 each in the flavors of grape, strawberry, mango and coffee. There are also 5 children. If each child is allowed to choose their own favorite flavor, what is the probability that all of them will get flavors of their choice?