There are 1800 gym members in total. 3 4 are aged 25 - 59 years, 1 5 are over 60 years and the remainder are under 25 years. how many members are under 25 years?

90

Step-by-step explanation:

3/4 Aged 25-59 = 1800x3/4= 1350

1/5 Over 60 = 1800/5=360

Rest Under 25 = 1800-360-1350= 90

three-fourths of an hour

36÷48=0.75

0.75=

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2