3. Maryjoy can bake a cake in 2 hours. Clarissa can do it in 4 hours. How long will
it take them to bake a cake if they joined together?
a. 2 hours
b. 1 1/3 hours
c. 1 1/6 hours
d. 5/3 hours
14. Yen-yen got an average grade of 91 on her 4 subjects. What must be her grade
on the fifth subject to get an average of 92?
a. 94
b. 95
c. 96
d. 97