Page 136 - NUMINO Challenge_A2
P. 136
04 Thomas wins 4 times and loses once, so they played 5 rounds of the game.
Suppose that Thomas lost at the 5th round. Look at the table below.
1st Round 2nd Round 3rd Round 4th Round 5th Round Total Number
of Steps
Thomas 3 3 3 3 1 11
Mike 1 11 1 3 1
Thomas went up 11 steps and Mike went down 1 step, so they are standing 12 steps apart.
05 There are 30 days in April, so the total amount of milk is 450 30 13500 mL when the
amount remains the same. Since 500 450 50, the amount increased by 50 mL.
14000 13500 500 mL, so the amount of milk increased for 500 50 10 days.
Therefore, the amount of milk increased on April 21st.
06 The product of the ages of the two children is 63, so find the factors of 63.
1 63 63, 3 21 63, and 7 9 63.
Subtract 1 from the age of the older child and add it to the age of the younger child.
Then the children will have the same age. The difference of their actual ages is 2 years.
Therefore, the older child is 9 years old and the younger child is 7 years old.
31Answer Key
Suppose that Thomas lost at the 5th round. Look at the table below.
1st Round 2nd Round 3rd Round 4th Round 5th Round Total Number
of Steps
Thomas 3 3 3 3 1 11
Mike 1 11 1 3 1
Thomas went up 11 steps and Mike went down 1 step, so they are standing 12 steps apart.
05 There are 30 days in April, so the total amount of milk is 450 30 13500 mL when the
amount remains the same. Since 500 450 50, the amount increased by 50 mL.
14000 13500 500 mL, so the amount of milk increased for 500 50 10 days.
Therefore, the amount of milk increased on April 21st.
06 The product of the ages of the two children is 63, so find the factors of 63.
1 63 63, 3 21 63, and 7 9 63.
Subtract 1 from the age of the older child and add it to the age of the younger child.
Then the children will have the same age. The difference of their actual ages is 2 years.
Therefore, the older child is 9 years old and the younger child is 7 years old.
31Answer Key
