MATHEMATICS

Simplify: 3x-(2y-4x) + 6y

• A. 7x+ 4y

• B. 7x-4y

Answer explanation

Solution:

3x - (2y - 4x) + 6y

3x - 2y + 4x + 6y

7x + 4✅✅

What is the coefficient in the expression 13x²y22

• A. 2

• B. 13

Simplify: 2x-(3y-[5x-(7y-6x) ]}

• A. -13x-10y

• B. 13x-10y

Answer explanation

Solution:

2x - {3y - [5x - (7y - 6x)]}

2x - {3y - [5x - 7y + 6x]}

2x - {3y - 5x + 7y - 6x}

2x - 3y + 5x - 7y + 6x

* 13x - 10y ✔️✔️

The total amount due on P20,000 which has been invested for five years at 10% annual interest is E CENTER

• A. P10,000

• B. P30,000

Answer explanation

Solution:

F = P (1 + rt)

F = 20,000 (1+(0.10)(5))

F = 20,000 (1+(0.5))

F = 20,000 (1.05)

F = 30,000 ✅✅✅

Skyway Company manufactures tables and chairs. In its catalog, a round table is priced at P6,000 less 15%. What will lah have to pay for the round table?

• A. P5,100

• B. P5,300

Answer explanation

Solution:

F = P (1-rt)

F = 6,000 (1-0.15)

F = 6,000 (0.85)

F = 5,100✅✅✅

In how many ways can 5 girls be seated in a row if 5 seats?

• A. 105

• B. 120

Answer explanation

Solution:

5x4x3x2x1

=120✅✅✅

What number must be subtracted from both numerator and denominator of the fraction 11/23 to give a fraction whose value is 2/5?

• A. 3

• B. 5

Answer explanation

Solution:

11-3 = 8

23-3= 20

8/20 or 2/5✅✅✅

In a Physics test, nine students obtained the following grades: 80,86,78,88,90,83,76,84,92. What is the median grade?

• A. 84

• B. 86

Answer explanation

Arrange first from least to greatest

76

78

80

83

84✅median

86

88

90

92

A ball is drawn at random from a box containing 6 red balls , 4 white balls and 5 blue balls . Find the probability that is white .

• A. 4/15

• B. 1/3

Answer explanation

Solution:

Base po sa given 4 white balls . So 4 all over the total balls . 6 +4+5= 15

4/15✅✅✅

Find the number of ways of selecting 4 books from 6 books in a shelf.

• A. 15

• B. 30

Answer explanation

Solution:

6! / 4!(6-4)! or

= 6x5x4x3x2x1 / 4x3x2x1(2x1)

= 720/24(2)

= 720 /48

= 15✅✅✅