Question

One young mouse weighs 3/10 of an ounce. Another weighs 45/100 of an ounce.

Answer 1

75/100 oz is he total weigh of both mice.
To solve this:
1) find common denominator (which is 100)
2) multiply the 3/10 by 10==> 30/100
3.) add the numerator: 30+45=75
4.) Answer is 75/100 which can be simplified to 3/4