For a classroom, it is planned to use 3DM square bricks to pave the floor, which needs 640 pieces. Now it is planned to use 4dm square bricks to pave the floor. How many pieces do you need? (use proportion solution) In proportion

480 yuan
Using 3 × 640 = 1920
Then 1920 △ 4 = 480

For Lingling's living room, 224 pieces of 3DM long square bricks are needed; how many pieces of 4dm long square bricks are needed?

Set X blocks
3*3*3*224=4*4X
2016=16X
X=2016/16
X=126
A: it costs 126 yuan

Using a kind of square brick to pave the floor, 360 pieces can pave 40 square meters, add 540 pieces, how many square meters can be paved in total?

If we add 540 more blocks, we can lay a floor of x square meters
40:360=x:(360+540)
360x=40×900
x=36000÷360
x=100

If you use the same square brick to pave the floor for 12 square meters, you need to use 48 square bricks. If you use 144 square meters, how many square bricks do you need? Use proportion

12∶144＝48∶x
12x＝144×48
x＝576

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