For their science experiment, Sheila and Martha tried different brands of popcorn to see which one popped the best. Their favorite brand, Pop Delight, had only about 30% of the kernels pop. Another brand, Pop King, had about 60% of the kernels pop. They decided that if they combined equal amounts of the two brands, they should be able to have 90% of the kernels pop. Popcorn
Is their thinking correct? Show examples to support your answer.