Question

80 is 40 percent of what number?

Answer 1

We have an equation: 80/?= 40/100

Cross multiply:
40*?= 80*100
⇒ ?= 80*100/40= 200

80 is 40% of 200~

Answer 2

0.4a=80 ----- ----- 0.4 0.4 a=200 Where a is the number times 40%, which is 0.4 in decimal form.