The figure, not drawn to scale, is made up of 3 different triangles R, S and T. 15% of triangle R and 25% of triangle T is shaded. The shaded area of R is the same as the shaded area of T. What fraction of the figure is shaded if 20% of Triangle S is shaded?
Unshaded area of R |
Shaded area of R |
Unshaded area of T |
Shaded area of T |
17x1 |
3x1 |
3x3 |
1x3 |
17 u |
3 u |
9 u |
3 u |
15% =
15100 =
320 25% =
25100 =
14 20% =
20100 =
15The shaded area of R is the same as the shaded area of T.
Make the LCM of the shaded area of R and shaded area of T the same.
LCM of 3 and 1 = 3
15 of S is shaded
= Shaded area of R + Shaded area of T
= 3 u + 3 u
= 6 u
Fraction of S that is unshaded
= 1 -
15 =
45 15 of S = 6 u
45 of S = 4 x 6 u = 24 u
Fraction of the figure that is shaded if 20% of Triangle S is shaded
=
6 + 617 + 24 + 9 + 6 + 6 =
1262=
631 Answer(s):
631