exam Maths Puzzle Numerical Ability

simplify (rad)2*(rad)3. isnt this just (rad)6 ?

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exam Other Question

Solve by the addition method

7x-4y=-3
x+2y=5

#24
x-y=3
-6x+6y=17 There are two water hoses. One fills a bucket in 30 min, the other hose fills at a rate of 45 min. How long to fill a bucket using both buckets? How do I set this up in an equation?