Question

Joven and Shu Ying shared some rulers in the ratio 1 : 9. If Shu Ying bought another 396 rulers, the new ratio of Joven's rulers to Shu Ying's rulers would be 7 : 72. How many rulers did Joven have?

Answer 1

Answer:

$308$

Step-by-step explanation:

let there's a multiplier $x$ so, in the first

Joven has $x$ rulers and Shu Ying has $9x$ rulers

cause Shu Ying bought new $396$ rulers

the new ratio can be formed from

$x / (9x + 396) = 7/72$

$72x = 7(9x + 396)$

by solving this equation gives us

$x = 308$

so, here's how many rulers that Joven has