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Math deduction 1 full mark.
Xiao Yong answered four questions. Formula: (100-76) ÷ (5+1) = 24 ÷ 6 = 4.

The answer process is as follows:

(1) Let Xiao Yong answer or not answer the wrong question. Then the number of questions correctly answered by Xiao Yong is 20-X.

(2) Re-evaluation: 5 points for correct answer, 1 point for wrong answer or no answer. Xiao Yong scored 76 points.

Available: 5×(20-x)-x× 1=76. This is a linear equation.

(3) Simplify to: 100-6x=76, and the solution is x=24/6=4.

A: Xiao Yong answered four questions: Yes or No?

Extended data:

The solution of one-dimensional linear equation;

(1) denominator: both sides of the equation are multiplied by the least common multiple of each denominator;

(2) bracket removal: first remove the bracket, then remove the bracket, and finally remove the braces;

(3) Move the term: move all terms containing unknowns to one side of the equation and all other terms to the other side of the equation;

(4) merging similar terms: transforming the equation into the form of ax=b(a≠0);

(5) The coefficient becomes 1.

The basis of solving equations

1. Move terms and symbols: move some terms in the equation from one side to the other with the previous symbols, and add, subtract, multiply and divide with the variation;

2. Basic properties of the equation.