Analysis: If the number represented by the worm (five knots) is set to X, the number represented by the clock (6 o'clock) is set to Y, and the number represented by the flower (1 flower) is set to M, then according to the picture, there is the following formula:

X+X+X=2 1 ①，2Y+X= 19 ②，M+Y+X= 15 ③.

Then according to formula ①, we can get that X=2 1/3=7, Y=( 19-7)/2=6 can be substituted into formula ②, and M= 15-6-7=2 can be substituted into formula ③.

But in the last formula, we can find that there are 6 knots, 2 flowers and 5 points in the last formula.

Then the number of watches carried by the six-knot worm is 6*7/5=8.4, 2 flowers =2*2=4, and 5 o'clock =5*6/6=5.

So the final result is 8.4+4*5=28.4.

Extended data:

Addition, subtraction, multiplication and division are called elementary arithmetic. Among them, addition and subtraction are called first-order operations; Multiplication and division are called secondary operations. When calculating at the same level, calculate from left to right in turn; Two-stage operation, first multiply and then divide, then add and subtract. When there are brackets, count the inside of brackets first, and then count the outside of brackets; When there are multiple brackets, count the brackets first, then the brackets inside, then the braces inside, and finally the brackets outside.

References:

Baidu encyclopedia _ elementary arithmetic