Question

Difficulty: MediumSolving Linear Inequalities

For all real values of nn that satisfy the inequality 32n4<3n225\frac{3 - 2n}{4} < \frac{3n - 22}{5}, what is the smallest possible integer value of nn?

Answer: 5

Answer

The smallest integer value of nn that satisfies the inequality is 5.
Solving the inequality yields n>103224.68n > \frac{103}{22} \approx 4.68. The smallest integer greater than 4.684.68 is 55.

Step-by-Step Solution

1
Multiply both sides by 20 to clear the denominators.
5(32n)<4(3n22)5(3 - 2n) < 4(3n - 22)
To eliminate the fractions and simplify the inequality.
2
Distribute the constants on both sides.
1510n<12n8815 - 10n < 12n - 88
To remove the parentheses.
3
Subtract 12n12n from both sides.
1522n<8815 - 22n < -88
To group the terms containing the variable on the left side.
4
Subtract 15 from both sides.
22n<103-22n < -103
To isolate the variable term on the left side.
5
Divide both sides by 22-22 and reverse the inequality sign.
n>10322n > \frac{103}{22}
Dividing by a negative number reverses the direction of the inequality sign.
6
Convert the fraction to a decimal to identify the boundary.
n>4.68n > 4.68
To find the smallest integer value that satisfies this condition.
7
Identify the smallest integer greater than 4.684.68.
55
The smallest integer greater than 4.684.68 is 55.

Key Concept

Solving linear inequalities by applying inverse operations and reversing the inequality sign when multiplying or dividing by a negative number.
Estimated Time:1m 30s
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