book Maths Puzzle Numerical Ability

(x^3-1)/(x-1)

thank you for your time

Read Solution (Total 0)

book Other Question

I NEED TO SET UP AN EQUATION FOR THIS WORD PROBLEM:
THE SUM OF TWO NUMBERS IS 18. THREE TIMES THE GREATER NUMBER EXCEEDS FOUR TIMES THE SMALLER NUMBER BY 5. FIND THE NUMBERS. How do you solve:

5x+3y-2z=112
7x+5y=70
3x+y=9z+96

and

3w+3x+6y+5z=10
4w+5x+8y+2z=15
3w+6x+7y+4z=30
4w+x+6y+3z=25