exam Maths Puzzle Numerical Ability

I have a triangle of 9 small triangles then 7 on top of those then 5 on top of that then 3 then 1. How many tooth picks are needed to form the mth triangular grid pattern?

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exam Other Question

If one month there is an increase of 50% and the next there is a decrease of 25% how much was the increase or decrease. A regular octagon is inscribed in a circle of radius 15.8 cm. Find the perimeter of the octagon.