Here is a 4-sided spinner. The sides of the spinner are labelled 1, 2, 3 and 4. The spinner is biased.
The probability that the spinner will land on each of the numbers 2 and 3 is given in the table.
The probability that the spinner will land on 1 is equal to the probability that it will land on 4.
Number
I
3
4
Probability
0.46
0.28
Sarah is going to spin the spinner 500 times.
Work out an estimate for the number of times it will land on 4.

140

1-.28 =.72
.72 x 500 = 360
500-360= 140

The original number was:  " 14 " .


 a + 5 = b ;

 b * 7 = 133 .

What is:  "a" ?

133 / 7 = 19 = b ;

a + 5 = b = 19 ;

a + 5 = 19 ;

Subtract "5" from each side of the equation;
to isolate "a" on one side of the equation; and to solve for "a" ;

    a + 5 − 5 = 19 − 5  ;

to get:

             a = 14  .

 Let us check our

Start with "14" ;

Add "5" :   "14 + 5 = 19 " .

then multiply by "7" :  "19 * 7"

and the result is: 133 ?

   19 * 7 = ? 133 ? Yes!