exam Maths Puzzle Numerical Ability

please help me figure this out

Solve for X 8(x-1)+3 = 7x-6-5x

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exam Other Question

WHAT IS A THREE DIMENSIONAL OBJECT WHICH HAS ONE BASE WITH SIDES OF THE SAME LENGTH? Can you please help me figure this one out.

If I invested $10,000, part at 15% and part at 14%.
If the total interest at the end of the year is $1430, how much did I invest at 15%?

Thanks for your help