human
Leila spent 3/4 of her savings on make-up and the rest on a sweater. If the sweater cost her $20, what were her original savings?
assistant
How much did Leila spend on a sweater? ** If Leila spent 3/4 of her savings on make-up, this means she spent 1- 3/4 = 1/4 of her savings on a sweater.
Define a variable ** Let S be her original savings.
How much did the sweater cost? ** If the sweater cost $20, this means 1/4 * S = $20.
How much did Leila spend on her original savings? ** Thus S = $20 * 4 = $<<20*4=80>>80.
#### 80