There are 15 boys what are you asking the sentence is not complete
I think you got to multiply the numbers hopefully I helped
You need Pythagorean theorem for this.
a² + b² = c², where c is the hypotheneus and a and b are the sides of the right triangle.
24² + x² = 26²
x² = 676-576
x = ±√100
x = 10 (-10 is rejected because length of triangle cannot be a negative number)
Answer:
Range = highest observation - lowest observation
180-157 = 23