Use letters to represent the sum of the following numbers a and 50 (), the difference between 2B and 8 (), the sum of 5 times of X and half of Y (), the quotient of 8 divided by M minus 6

Use letters to represent the sum of the following numbers a and 50 (), the difference between 2B and 8 (), the sum of 5 times of X and half of Y (), the quotient of 8 divided by M minus 6

Use letters to represent the sum of a and 50 (a + 50), the difference between 2B and 8 (2b-8), the sum of 5 times of X and half of Y (5x + 1 / 2Y), the quotient of 8 divided by M minus 6 (8 / M-6)

15 of a number is 9 less than 12. Find the number

Let this number be X & nbsp; 12x-15x = 9 & nbsp; & nbsp; & nbsp; & nbsp; 310x = 9310x ／ 310 = 9 ／ 310 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 30 A: this number is 30

Dad thought of a number in his heart. He added 10, multiplied 10, subtracted 10, and then divided by 10. The result was still 10
A caterpillar, from larva to adult, grows twice a day. It can grow to 40 cm in 20 days and () days in 10 cm
If a number is divided by 12, Xiaoming takes 12 as 18, the result quotient is 20, and the correct quotient is ()
Xiaoming said: "I think about a score, with 2 about twice, with 3 about once, finally get five sixths."

The number is 1. Hint: inverse operation
The second question: 18 days
Question 3: the correct quotient is 30
Question 4: the original score is 60 / 72

Add 2 to a number, subtract 2, multiply 2 by 2, divide 2, and then add the four results to get the sum of 10.35

This number = 10.35 △ (1 + 1 + 0.5 + 2) = 2.3