Question

От куска материи длиной 7 метров отрезали сначала 0,3 всего куска, а потом еще 20% остатка. Сколько материи осталось?

Answer 1

100%-30%=70%

70%=0,7

20%=0,2

0,2*0,7=0,17 или 14% отрезали от всего куска

14%+30%=44% отрезали всего

100%-44%=56%осталось

Answer 2

Problem Analysis

We are given a piece of fabric that is 7 meters long. First, we cut off 0.3 meters from the total length of the fabric. Then, we cut off an additional 20% of the remaining fabric. We need to determine how much fabric is left after these two cuts.

Solution

To find the amount of fabric left, we need to subtract the length of the first cut (0.3 meters) from the total length of the fabric. Then, we need to subtract 20% of the remaining fabric from the result.

Let's calculate it step by step:

1. Subtract the length of the first cut (0.3 meters) from the total length of the fabric (7 meters): - 7 meters - 0.3 meters = 6.7 meters

2. Calculate 20% of the remaining fabric (6.7 meters): - 20% of 6.7 meters = 0.2 * 6.7 meters = 1.34 meters

3. Subtract 20% of the remaining fabric (1.34 meters) from the remaining fabric (6.7 meters): - 6.7 meters - 1.34 meters = 5.36 meters

Therefore, there is 5.36 meters of fabric left after the two cuts.

Answer

After cutting off 0.3 meters from a piece of fabric that was initially 7 meters long and then cutting off an additional 20% of the remaining fabric, there is 5.36 meters of fabric left.