Custom Binary Operation Solve

1000BeginnerAlgebra

South African Mathematics Olympiad

If $a \bullet b$ means the value of $ab + a + b$, and $5 \bullet x = 35$, the value of $x$ must be (A) 5 (B) 7 (C) 9 (D) 12 (E) 15

0 students attempted0% solvedRating 1000

Related practice paths

Create an account to submit answers, save history, and track your rating.

Progressive Hints

Unlock hints one at a time — each reveals a little more without spoiling the solution.

Step-by-Step Solutions1

Multiple solution approaches with detailed walkthroughs, unlocked after you solve the problem.

AI-Powered Grading

Instant feedback on your answer — handles fractions, decimals, and equivalent forms.

Curated problem bank

Supported tracks for AMC, AIME, MATHCOUNTS, and olympiad-style training, plus global problem sources like UKMT, Euclid, and Kangaroo.

1000BeginnerAlgebra

South African Mathematics Olympiad

If $a \bullet b$ means the value of $ab + a + b$, and $5 \bullet x = 35$, the value of $x$ must be (A) 5 (B) 7 (C) 9 (D) 12 (E) 15

0 students attempted0% solvedRating 1000