(19) In a school of 320 pupils. 0.625 are girls and 0.3 of the boys have long hair. How
many boys have short hair​

32

Step-by-step explanation:

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

y=mx+b

step-by-step explanation:

m slope

b y-intercept