book Maths Puzzle Numerical Ability

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

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book Other Question

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? Brandon pays $4.95 a month for a long distance telephone service that offers a flat rate on 7 cents per minute. One month his total long distance bill was $10.69. How many minutes of long distance telephone calls were made that month?