What adds to 2 and multiplies to get -24

If 20% of a number is 35, what is 50% of that number?

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?