1. 5m of cloth costs 80 000 VND. How much does 7m of the same cloth cost?Mua 5m vải hết...

One more way to solve this problem is to see that 7m is 2 more meters than 5m. Therefore, we add the cost of 2 extra meters to the original cost of 80,000 VND. This gives us 80,000 + (2 x 16,000) = 112,000 VND for 7m of the same cloth.

We can think of this problem as buying 2 extra meters of cloth (7m instead of 5m). The cost of these 2 extra meters would be 2 x 16,000 = 32,000 VND. Adding this to the original cost of 80,000 VND, we get 80,000 + 32,000 = 112,000 VND for 7m of cloth.

Another way to approach this problem is to find the price per meter of cloth first, which is 80,000 / 5 = 16,000 VND. Then, we multiply this price by 7 to get the total cost of 7m of cloth, which is 16,000 x 7 = 112,000 VND.

Alternatively, we can set up a proportion: 5m is to 80,000 VND as 7m is to x VND. Cross multiplying, we get 5x = 560,000. Dividing by 5, we find that x = 112,000 VND.

To find out the cost of 1m of cloth, we divide 80,000 by 5, which equals 16,000 VND. Therefore, the cost of 7m of the same cloth would be 16,000 x 7 = 112,000 VND.