alleryStart learning →Two numbers differ by 9 and their sum is 51. What is the smaller number?
A25
B42
C30
D21
Answer & Solution
Correct answer: D. 21
x + (x + 9) = 51 gives 2x = 42, so the smaller number is 21.
Keep practising Simple Linear Equations
Browse all Simple Linear Equations questions for Olympiad (Class 7), or explore more Mathematics topics.
Related questions
Doubling a number and adding 3 gives the same as adding 10 to it. Find the number.The statement 'the sum of x and 7 is 19' is written asWhich of these numbers makes 3x - 1 equal to 5?Dividing both sides of 8x = 56 by which number isolates x?Which number multiplies both sides of x/6 = 5 to isolate x?What must be added to both sides of x - 7 = 5 to get x alone?One number is 12 less than three times another and their sum is 56. What is the larger numSeema gives away 8 marbles and is left with half of what she began with. How many did she