When a number is decreased by 5%, the result is 20. What is the original number to the nearest tenth?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250