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- PuzzlingLv 71 month agoFavourite answer
Start by writing an equation:

"Seven plus..."

7 +

"...twice a number..."

7 + 2x

"... is ten"

7 + 2x = 10

To solve that, start by subtracting 7 from both sides. This will begin to isolate the variable x.

2x = 10 - 7

2x = 3

Next, divide both sides by 2.

x = 3/2

x = 1½

Answer:

The number is 1½ (or 1.5)

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