Lu-yin predicts that 80% of the people she invites to her party will come. If she wants to have at least 20 guests, how many people should she invite to her party?
250 people
16 people
25 people
150 people

Question

Lu-yin predicts that 80% of the people she invites to her party will come. If she wants to have at least 20 guests, how many people should she invite to her party?
	250 people
	16 people
	25 people
	150 people

vocaloid · Answer

80% = 80/100 = 0.8

let x be the number of party guests that she invites

80% of x can be represented as 0.8x, which equals the number of guests who will show up 

0.8x = 20

solve for x