Mary raked 40% of her yard and filled 12 bags of leaves. How many bags will she need for the whole yard?

30 bags

Step-by-step explanation: she raked 40 % of the yard to fill up 12 bags , by proportion: 40% = 12bags 1% = 12/40 bags, Then 60 % = 12/40 x 60 = 18 Therefore the total bags needed to fill the whole yards will be 18 + 12 = 30

Hope this helps :)

actually your concept is wrong

step-by-step explanation:

150% of x =300

150x=300×100

x=(300×100)÷150

x=200