exam Maths Puzzle Numerical Ability

How do i find the original price after sale tax has been added, such as:

The cost of the camera with sales tax included was $50(sales tax was 5%), what was the original cost of the camera?

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exam Other Question

I am having major trouble with logarithms, please help??

simplify: log >3 81 (the three is on the bottom of the log)

simplify: log a^1/2 b^2 / c^3

simplify: log x = 3 An experimental electric-solar car completed a 1000-mi. race in 35 hrs. For the 600 mi. traveled during daylight the car averaged 20 mph more than it did for the 400 mi. traveled at night. What is the average speed of the car during the daytime?