When 50x-2:1 is equal to 6 × 4:3, 7:2.8, 10:4:1 A factory used 630 kilowatt hours of electricity last month, 5% more than this month. How many kilowatt hours of electricity this month

When 50x-2:1 is equal to 6 × 4:3, 7:2.8, 10:4:1 A factory used 630 kilowatt hours of electricity last month, 5% more than this month. How many kilowatt hours of electricity this month

The monthly electricity consumption is set at x kwh
（1+5％）x=630
1.05x=630
x=600

70 percent plus (30 minus x) multiplied by 50 percent equals 30 times 65 percent

70/100x+（30-x）*50/100=30*65/100
7x/10+15-0.5x=19.5
0.2x=4.5
2x=45
x=45/2
x=22.5

How much is 63 equal to 0.3

3 = 210
63：210=0.3

1. Number a plus number B is equal to the reciprocal of number a minus number B () 2. 0.37 meters can be written as 37% meters or 37% meters ()
3. Seven eighths of a ton is as heavy as one eighth of seven tons
4. If 100 trees survive in the school tree planting activities, the survival rate is 100% ()
5. The number of girls in Hongxing primary school and Shengli primary school accounts for 54% of the total number of students in the school, while the number of girls in the two primary schools is equal ()
(judgment question)

1. Number a plus number B is equal to the reciprocal of number a minus number B (×) 2. 0.37 meters can be written as 37% meters or 37% meters (×) 3. Seven eighths of a ton is as heavy as one eighth of seven tons (√) 4. If 100 trees survive in the school tree planting activities, the survival rate is 100% (×) 5