Sarah is three times older than she was 10 years ago. At that time Sarah's mother was 20 years older than Sarah. How old is her mother now?

Her mother is 35 years

Step-by-step explanation:

Let her present age be x

10 years ago the age will be x-10

From the question;

x = 3(x-10) ••••(i)

Her mother’s age at that time is (x-10+20) = x + 10

so we want her mother’ s age now

from equation i

x = 3x - 30

3x - x = 30

2x = 30

x = 30/2

x = 15

her mother’s age then is 15 + 10 = 25

Her age now will be 25 + 10 = 35 years

answer: the resulting cross section is a rectangle. solution: a plane parallel to the base of a triangular prism will intersect a cross section that is the same shape as its bases. so the cross section is a triangle.

step-by-step explanation: