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P, Q, and R are successive even natural numbers in ascending order. Five times R is eight more than seven times P. Find Q.

Sagot :

Let's solve this problem step by step.

1. We know that [tex]\( P \)[/tex], [tex]\( Q \)[/tex], and [tex]\( R \)[/tex] are successive even natural numbers in ascending order. Therefore, we can represent them as:
[tex]\[ Q = P + 2 \][/tex]
[tex]\[ R = P + 4 \][/tex]

2. According to the problem, five times [tex]\( R \)[/tex] is eight more than seven times [tex]\( P \)[/tex]. We can write this relationship as an equation:
[tex]\[ 5R = 7P + 8 \][/tex]

3. Substitute [tex]\( R = P + 4 \)[/tex] into the equation:
[tex]\[ 5(P + 4) = 7P + 8 \][/tex]

4. Distribute the 5 on the left-hand side:
[tex]\[ 5P + 20 = 7P + 8 \][/tex]

5. Rearrange the equation to isolate [tex]\( P \)[/tex] on one side:
[tex]\[ 5P + 20 - 7P = 8 \][/tex]
Simplify further:
[tex]\[ -2P + 20 = 8 \][/tex]

6. Solve for [tex]\( P \)[/tex]:
[tex]\[ -2P = 8 - 20 \][/tex]
[tex]\[ -2P = -12 \][/tex]
[tex]\[ P = 6 \][/tex]

7. Now that we have [tex]\( P = 6 \)[/tex], let's find [tex]\( Q \)[/tex]:
[tex]\[ Q = P + 2 \][/tex]
[tex]\[ Q = 6 + 2 \][/tex]
[tex]\[ Q = 8 \][/tex]

8. For completeness, let's also find [tex]\( R \)[/tex]:
[tex]\[ R = P + 4 \][/tex]
[tex]\[ R = 6 + 4 \][/tex]
[tex]\[ R = 10 \][/tex]

So the successive even natural numbers are [tex]\( 6 \)[/tex], [tex]\( 8 \)[/tex], and [tex]\( 10 \)[/tex]. Therefore, the value of [tex]\( Q \)[/tex] is [tex]\( 8 \)[/tex].