exam Maths Puzzle Numerical Ability

write an equation for: 4 consecutive numbers, the sum of the first 3 numbers is equal to 54 more than the 4th number

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exam Other Question

Solve and graph.
x + 6 < - 3 or x + 6 > 1
The solution is {xlx < ? or x > ?
Can someone please help me? I do not no these at all, no matter how much I read.
Simplify by combining like terms

2 sqrt (5x) + 5 sqrt (5x) - sqrt (5x)