Question

Convert the following statement into equations:-
a) 3 added to a number is 11
b)2 substracted from a number is equal to 15
c) 3 times a number decrease by 2 is 4
d) 2 times the sum of the no. x and 7 is 12.​

Answer 1

Answer:

1. 3+x=11

2. x-2=15

3. 3x/2=4

4. 2x+7x=12

Answer 2

( iii ) 2 times the sum of the no x and 7 is 13

answer = 2 times means * 2 ;

The equation is : 2 ( x + 7 ) = 13 , solution:

2 ( x + 7 ) = 13

x + 2 = 13 / 2

x = 13 / 2 - 7 ; By taking LCM we get denominator 2

x = ( 13 - 14 ) / 2

x = -1/2

( Or we can do like this)

2 ( x + 7 ) = 13

( 2 * x ) + ( 2 * 7 ) = 13

2x = 13 - 14

2 x = -1 /2

so 'x ' = -1/2

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