Mr. Palsey decided to lose weight. He went from 240 pounds to 228pounds. By what percentage did Mr. Palsey decrease in weight?

The ratio of rock songs to dance songs on jonathan’s mp3 player is 5: 6. the total number of rock and dance songs jonathan has is between 101 120. how many rock songs does he have?

What is the shape of the height and weight distribution

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.