exam Maths Puzzle Numerical Ability

Need the number of distinguishable permutations for:
ALGEBRA - i said 2520 - is that right
MISSOURI - ?????? cant get that one

Find the number of permutations: 9P4 and 16P3 (

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exam Other Question
owen is 3 years less then twice as old as his sister rena. if owen is 13,how old is rena? How much water must be evaporated from 240 gallons of a 3% salt solution to produce a 5% salt solution?