Page 33 - Arithmetic

Explanation:
1. The required number is 11. 7214 + 11 = 7225 which is a perfect square
2. There are as many rows as there are the saplings in each row. If the row is x, the number of saplings would be x.
So, x2 = 46225
x = √46225
x = 215
𝑥
3. √0.16 = 16
𝑥 =16 √0.16
𝑥 =16 0.4
x = 6.4
4. √5𝑛 = 3125 √5𝑛 = 55
𝑛 or52 =55
In exponents when bases are the same power can be equated. 𝑛=5
2
n = 10
5. 0.15÷p2 =15
0.15 = p2 15
p2= 0.01 p = 0.1
6. Speed of the meteoroid = 76 miles per day Time travelled by the meteoroid = 72 days Distance = Speed × Time
Distance = 76 × 72 = 76+2 = 78 miles
7. Let the number of residents be y
Let the amount contributed by each resident be y cents Total amount collected = 4225 cents
y × y = 4225
y2= 4225
y = √4225
y = 65
65 residents live in the society
Page 32 of 55
Arithmetic Concept