Answer:
1682
Step-by-step explanation:
2120 grams of sand in bucket - 438 grams of sand in cup = 1682 :)
Here’s a photo explaining the answer.Im assuming the leanght is x plus 4 and breadth is x
X+y=28
xy=7
xy=7
divide both sides by x
y=7/x
sub 7/x for y in first equation
7/x+x=28
times both sides by x
7+x^2=28x
minus 28x from both sides
x^2-28x+7=0
use quadratic formula
if
ax^2+bx+c=0
x=
x=
x=
sub for y
y=7/x
y=
the reciprocals are
and
times first one by
and second by 7/7
evaluate the plus and minus yourself please, my head hurts