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Use 8 pumps to pump water. Each pump pumps 7 tons per hour. How many tons can be pumped in 5 hours
7 * 8 * 5 = 280 tons
There are 280 tons of water in the pool, which is pumped by 8 pumps. Each pump can pump 7 tons per hour. How long does it take to finish pumping the pool
A math problem in the third grade summer vacation homework
Xiao Ming has four pieces of 10 yuan, three pieces of 5 yuan, two pieces of 1 yuan, one piece of 5 jiao, three pieces of 2 jiao, one piece of 1 jiao in his pocket. He wants to buy a toy violin, the price is 32 yuan and 6 jiao
Four payment methods are required:
one
3 pieces of 10 yuan, 2 pieces of 1 yuan, 1 piece of 5 jiao, 1 piece of 1 jiao equals 32,6 yuan
two
Two 10 yuan, two 5 yuan, two 1 yuan, three 2 jiao equals 32.6 yuan
three
Three 10 yuan, two 1 yuan, three 2 jiao equals 32.6 yuan
four
?
Two 10 yuan, two 5 yuan, two 1 yuan, one 5 jiao, one 1 jiao
A three digit number and a three digit number are 3. If the one digit number is changed to a hundred digit number, the original hundred digit number is changed to a ten digit number; if the original ten digit number is changed to a one digit number, the new number is 171 less than the original number, and the original number is calculated
Let the original hundred and ten digits be x, the original number = 10x + 3, the new number = 300 + X, 300 + x = 10x + 3-171, 9x = 468, x = 52, the original number = 523; answer: the original number is 523
Math tower, fill in the blanks
(1) 2 × 4 = 8, 8 × 2 = 16, 8 × 8 = 64; (2) 8 + 2 = 10, 12 + 3 = 15, 16 + 4 = 20, so this digital tower can be supplemented completely, as shown in the figure below:
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