Question

Omar paved a 6 foot walkway using 20 stones. He now wants to extend the walkway to 9 feet. How many more stones will he need to buy?

Answer 1

Apply proportional ratio:
x stones/ 9 ft = 20 stones/ 6 ft

Answer 2

Set up a proportion:
6/20 = 9/x
x will be the total number of stones. Then perform x-20 to get the number of additional stones to buy

Answer 3

@wombat: I've learnt it from you :D

Answer 4

aren't proportions amazing X)

Answer 5

thanks guys

Answer 6

Notice that x is the number of stones needed for 9 ft,
Since we already had stones for 6 ft,
=> We only need x - 20 stones MORE :)

Answer 7

Good one @Chlorophyll

Answer 8

@wombat AFTER you ; )

Answer 9

haha age before beauty :P @Chlorophyll