How to show that triangles are similar?

How many grams must be adde to 970g to make 1 and a half kg

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?