Question

Ahmed recorded the temperature outside his window one morning. On the second day, the temperature went up 7 degrees. On the third day, the temperature went down 10 degrees. On the fourth day, the temperature went down 6 degrees, and it was 1°F.What was the temperature on the first day?

Answer 1

`-2^(\circ)\text{F}`

Explanation:

Let
`x` be the temperature on the first day

Second day temperature

`x+7`

Third day temperature

`x+7-10`

Fourth day temperature was
`1^(\circ)\text{F}`

`x+7-10+6=1\\\Rightarrow x+3=1\\\Rightarrow x=1-3\\\Rightarrow x=-2^(\circ)\text{F}`

On the first day the temperature was
`-2^(\circ)\text{F}`