Solve the equation by finding the common multiple. three fourths minus two fifths plus eight twentieths equals blank

seven twentieths
fifteen twentieths
twenty fifteenths
thirteen twentieths i need help asap

15/20(=3/4)

Step-by-step explanation:

3/4-2/5+8/20=...

15/20-8/20+8/20=15/20

15/20 or fifteen twentieths

Step-by-step explanation:

3/4 -2/5 + 8/20 = ?

make all the denominators 20 because 4 and 5 are factors of 20

15/20-8/20+8/20 =

15/20 - 0 =

15/20 or fifteen twentieths

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

you never say the total so we cant find the percentage used for petrol

step-by-step explanation: