book Maths Puzzle Numerical Ability

a to b is 10 miles further than b to c. b to c is 10 miles further than c to d. the distance from a to d is 390 miles..what is the distance from a to b?

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book Other Question

square root x+4+3 using graphing utility The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than
Niagara Falls. If each of the falls were 7 m lower, the upper Angel Falls
would be 16 times as high