exam Maths Puzzle Numerical Ability

Please help me solve this problem: -4/8 < 2/3c. I understand how to get the 2/3 on the other side but when I get to the multiplying part I get stuck.

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exam Other Question

i have to find the volume of a rectangular square pyramid with a base edge 4 and height 6 m. An isoceles triangle has a perimeter of 45cm. Its equal sides each measure 6cm longer than the base. How long is the base of the triangle?