The teacher said, I have through of a number. If you add $7$ to $3$ times the number, you get $31$ . What number have I through of ? can your answer the teachers questions?

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Solution

Let $x$ be the number thought by the teacher
$3 x + 7 = 31$
$\Rightarrow$ $3 x = 31 - 7$
$\Rightarrow$ $3 x = 24$
hence the answer is
$x = \frac{24}{3} = 8$

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The teacher said, I have through of a number. If you add 7 to 3 times the number, you get 31. What number have I through of ? can your answer the teachers questions?

Let x be the number thought by the teacher 3x+7=31⇒ 3x=31−7⇒ 3x=24 hence the answer is x=243=8

The teacher said, I have through of a number. If you add $7$ to $3$ times the number, you get $31$ . What number have I through of ? can your answer the teachers questions?

Let $x$ be the number thought by the teacher
$3 x + 7 = 31$
$\Rightarrow$ $3 x = 31 - 7$
$\Rightarrow$ $3 x = 24$
hence the answer is
$x = \frac{24}{3} = 8$