exam Maths Puzzle Numerical Ability

How many three digit numbers can be formed using the digits 1,2,3,4,5,6 and 7 if no digit can be replaced in a number? I have a slight Idea on how to do this but I get stuck every

Read Solution (Total 0)

exam Other Question

-9-/108 over 3

(/ is the radical sign)

Thanks for all your help...step by step help would help a lot!
CH a contractor has a 24-pound mixture that is no-fourth cement, and three-fourths sand. How much of a mixture that is half cement and half sand needs to be added to produce a mixture that is one-third cement?