The average age of 12 students is 20 years. If the age of one more student is included, the average decreases by 1, what is the age of the new student ?

A mixture of 20 kg of spirit and water contains 10% water. How much water must be added to this mixture to rai...

A number consists of two digits. The sum of the digits is 9. If 63 is subtracted from the number its digits ar...

If 4 times an integer x is increased by 10 , the result is always greater than 18 and less than 34 . what is t...

when a positive integer K is divided by 6 , the remainder is 3 , what is the remainder when 5 k is divided by...

For some value of x , 5(x+2) =y . After the value of x is increased by ,3 5(x+2) =z. what is the value of (z -...

An ice cream parlour makes an ice cream using one of six different flavors of ice cream, one of three differen...