Answer:
C.21
Step-by-step explanation:
because if the question says trinity is twice the age of summer just do 42 divided by two which equals 21, to make sure just do 21 x 2 which equals 42.
Hope this helps.
a. 14
make equations
2x this is how old trinity is
x + 2x =42 their ages combined, solve equation
3x =42
14
