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8. Linear Equations in One Variable
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Q1 of 46 Page 156

If 4 is added to a number and the sum is multiplied by 3, the result is 30. Find the number.

Let the Number be x,


4 added to number, ⇒ x + 4


Summultiplied by 3, result is 30


⇒ 3(x + 4) = 30


⇒ x + 4 = 10


⇒ x = 6.


More from this chapter

All 46 →
1

Solve the following:

(i) x + 3 = 11 (ii) y - 9 = 21


(iii) 10 = z + 3 (iv)


(v) 10x = 30 (v) 10x = 30


(vi) (vii)


(viii) (ix) 8x – 8 = 48


(x) (xi)


(xii) (xiii) 3(x + 6) = 24


(xiv) (xv) 3(x + 2) – 2(x – 1) = 7

2

Solve the Equations

(i) 5x = 3x + 24 (ii) 8t + 5 = 2t – 31


(iii) 7x – 10 = 4x + 11 (iv) 4z + 3 = 6 + 2z


(v) 2x – 1 = 14 – x (vi) 6x + 1 = 3(x – 1) + 7


(vii) (viii)


(ix)3(x + 1) = 12 + 4(x – 1) (x) 2x – 5 = 3(x – 5)


(xi) 6(1 – 4x) + 7(2 + 5x) = 53 (xii) 3(x + 6) + 2(x + 3) = 64


(xiii) (xiv) (3/4) ( x - 1) = (x - 3)

2

Find three consecutive odd numbers whose sum is 219.

3

A number subtracted by 30 gives 14 subtracted by 3 times the number. Find the number.

Questions · 46
8. Linear Equations in One Variable
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