Question

when 7 times a number is increased by 5 the result is 54 find the number .

A : 2
B : 7
C : 5
D : 12

Answer 1

Answer is B you take 7 times 7 and then add 5

Answer 2

$7 \times a + 5 = 54 \\ 7a + 5 - 5 = 54 - 5 \\ 7a = 49 \\ \frac{7a}{7} = \frac{49}{7} \\ a = 7$

"a" represents the unknown value.

hope that helped!