Question

What number can be divided into 9 and 10 equal groups without a remainder?

A. 60
B. 80
C. 150
D. 180

Answer 1

180

Explanation:

The question is trying to ask which one can be divided by 9, and 10.

Solution 1:

60/9 = 6.666 ❌

80/9 = 8.888 ❌

150/9 = 16.666 ❌

180/9 = 20 ✔

180/10 = 18 ✔

180

Solution 2:

The LCM of 9 and 10 is 90, so we're trying to find a number divisible by 90. The only number that is divisible by 90 is 180, thus 180 is our answer

Answer 2

D) 180

Explanation:

60/10 has no remainder, but 60/9 has a remainder, so it's not A

80/10 has no remainder, but 80/9 has a remainder, so it's not B

150/10 has no remainder, but 150/9 has a remainder, so it's not C

180/10 has no remainder and so does 180/9, so it's D