alleryStart learning →Add 15 to a number and multiply the result by 3 to get 90. What is the number?
A15
B45
C30
D5
Answer & Solution
Correct answer: A. 15
Undo the steps: 90 ÷ 3 = 30, then 30 − 15 = 15.
Keep practising Arithmetic
Browse all Arithmetic questions for Olympiad (Class 5), or explore more Mathematics topics.
Related questions
Multiply 25 by 4, divide by 5, then add 10. What is the result?Fill the blank with the least digit so that 6_8 is a multiple of 3.Which 4-digit multiple of 5 is the greatest?Name the biggest 3-digit multiple of 9.A rope is 8 m long. After 3 m 75 cm is cut off, how long is it?A can holds 5 litres. After 2350 mL is used, how much is left?Add 4 kg 250 g and 2 kg 900 g.Add 2 h 45 min and 1 h 30 min.