If a = 5, the value of 2a + 5 is ____________

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If a = 5, the value of 2a + 5 is 15

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Chapter 3: Algebra - Exercise 3.3 [Page 68]

Chapter 3 Algebra
Exercise 3.3 | Q 1. (ii) | Page 68

Write the following using literals, numbers, and signs of basic operations:
y decreased by 7

Identify the like terms in the following:

−2xy², x²y, 5y²x, x²z

Subtract:

6x³ − 7x² + 5x − 3 from 4 − 5x + 6x² − 8x³

Subtract:

x³ + 2x²y + 6xy² − y³ from y³ − 3xy² − 4x²y

Find the variables from the clues given below and solve the cross-word puzzle.

Across	Down
x + 40 gives 100	x is 1005 multiplied by 6
7 reduced from t gives 31	t ÷ 7 = 5
z is 5 added 5 times	p is the predecessor of first 3 digit number
v is the whole number zero plus number of days in a ordinary year	z is the number of weeks in a year (digits reversed)
k is 24 added to 25	k is 11 times 4
u is 2 added to two times 11 gives the number of hours in a day	u is product of 23 and 9
a is 20 more to 40	a is 4 added to the product of 12 and 5
s minus 1 gives 246 is the number of letters in Tamil language	m is the successor of 9

Sharad used to take p cups tea a day. After having some health problem, he takes p – 5 cups of tea a day.

The number of students dropping out of school last year was m. Number of students dropping out of school this year is m – 30.

The number of girls enrolled in a school last year was g. The number of girls enrolled this year in the school is 3g – 10.

Which of the following numbers satisfy the equation –6 + x = –12?

In a test Abha gets twice the marks as that of Palak. Two times Abha’s marks and three times Palak’s marks make 280.