Question

What is the value of x?
3
4
5
6

Answer 1

x = 6

Explanation:

Using the relationships between the entries in the table, you can find x two different ways.

1.

The numbers down the Total column add to give the one at the bottom:

0.1 + 0.09x = 0.64

0.09x = 0.54 . . . . . . . subtract 0.1

x = 6 . . . . . . . . . . . . divide by 0.9

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2.

The product of the numbers in the first two columns is the number in the third. On the bottom row, this means ...

(2 +x)(0.08) = 0.64

2 +x = 8 . . . . . . . . . . . divide by 0.08

x = 6 . . . . . . . . . . . subtract 2