Question

(a) If 11 is added to a certain number, the sum becomes 19. Frame an equation for the statement and find the number.
(b) If a number is increased by 12, it becomes 21. Find the number.
(c) If 8 is subtracted from a number, we get 18. Frame an equation for the statement and find the number.
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Answer 1

Answer:

a) let the number be $x$

11 + $x$ = 19

Subtracting 11 for both sides we get:

$x$ = 8

b) let the number be $y$

increased by 12 means the number plus 12

$y$ + 12 = 21

Subtracting 12 for both sides we get:

$y$ = 9

c) let the number be $z$

9 subtracted from it; that just means $z$ - 9

$z$ - 9 = 18

Adding 9 for both sides...

$z$ = 27