Question

A radio battery can last 100 minutes when fully charged. It says on one battery that 22% of the charge time is left. How many minutes are left on the radio battery?
A. 22 minutes
B. 78 minutes
C. 100 minutes
D. 122 minutes

Answer 1

it can last 100 minutes when it's 100%

Make direct proportion to find the current minute (I made the exact formula with the photo)

100% 100 mins

22% ?

? =

$\frac{22 \times 100}{100}$

(opposite number of ? must be in denominator

so it's 22 minutes.

Hope it helps!