exam Maths Puzzle Numerical Ability

Simplify.
SR of 45 Divided by 10 + 7 Times SR of 5 divides by 10

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exam Other Question

I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power a trinagle has a perimeter of 46cm. The longest is twice as long as the shortest side. the third side is 6cm longer than the shortest side. the length of the shortest side is ___cm