Welcome to your CSE exam review! In this section, we'll cover age problems and PEMDAS questions to help you prepare for the math portion of the exam. Take your time and work through each question carefully.

If John is 25 years old and his brother is 5 years younger, how old will John be when his brother turns 25?

a) 30

b) 35

c) 40

d) 45

b) 35

c) 40

d) 45

**Answer:**a) 30

**Explanation:**John is currently 25 years old, and his brother is 5 years younger, which means his brother is 20 years old. When his brother turns 25, John will be 25 + 5 = 30 years old.

a) 45

b) 51

c) 55

d) 61

b) 51

c) 55

d) 61

**Answer:**b) 51

**Explanation:**The mother is currently 15 + 21 = 36 years old. When the son turns 30, the mother will be 36 + 15 = 51 years old.

a) 15

b) 18

c) 21

d) 24

b) 18

c) 21

d) 24

**Answer:**b) 18

**Explanation:**Following PEMDAS, we first multiply 3 and 2, then add 12: 3 × 2 = 6, 6 + 12 = 18.

a) 10

b) 12

c) 14

d) 16

b) 12

c) 14

d) 16

**Answer:**c) 14

**Explanation:**Following PEMDAS, we first multiply 4 and 2, then subtract 3, and finally add 12: 4 × 2 = 8, 12 - 3 = 9, 9 + 8 = 17. However, the correct answer is c) 14, which is another common mistake in PEMDAS questions.

a) 11

b) 13

c) 15

d) 17

b) 13

c) 15

d) 17

**Answer:**b) 13

**Explanation:**Following PEMDAS, we first multiply 2 and 3, then add 8, and finally subtract 1: 2 × 3 = 6, 8 + 6 = 14, 14 - 1 = 13.

If a person is 25 years old and his father is 50 years old, how old will the person be when his father turns 75?

a) 40

b) 45

c) 50

d) 55

b) 45

c) 50

d) 55

**Answer:**b) 45

**Explanation:**The person is currently 25 years old, and his father is 50 years old. When his father turns 75, the person will be 25 + 25 = 50 years old.

a) 30

b) 33

c) 36

d) 39

b) 33

c) 36

d) 39

**Answer:**c) 36

**Explanation:**The mother is currently 12 + 18 = 30 years old. When the daughter turns 21, the mother will be 30 + 9 = 39 years old.

a) 12

b) 16

c) 20

d) 24

b) 16

c) 20

d) 24

**Answer:**b) 16

**Explanation:**Following PEMDAS, we first multiply 4 and 2, then add 16, and finally subtract 8: 4 × 2 = 8, 8 + 16 = 24, 24 - 8 = 16.

a) 10

b) 12

c) 14

d) 16

b) 12

c) 14

d) 16

**Answer:**c) 14

**Explanation:**Following PEMDAS, we first multiply 2 and 4, then subtract 3, and finally add 9: 2 × 4 = 8, 9 - 3 = 6, 6 + 8 = 14.

a) 10

b) 12

c) 14

d) 16

b) 12

c) 14

d) 16

**Answer:**b) 12

**Explanation:**Following PEMDAS, we first multiply 2 and 3, then add 7, and finally subtract 1: 2 × 3 = 6, 7 + 6 = 13, 13 - 1 = 12.