Question Text
Question 1 :
Is it TRUE or FALSE, substituting x = -3 in $x^2+5x+4x$ gives $(-3)^2+5(-3)+4 = 9+2+4=15$ ?
Question 21 :
Aman's age is three times his son's age. Ten years ago, he was five times his son's age. Find the present age of Aman.
Question 22 :
Two numbers are in the ratio 5:3. If they differ by 18, what are the numbers?
Question 24 :
One of the two digits of a two-digit number is three times the other digit. If you interchange the digit of this two-digit number and add the resulting number to the original number, you get 88. What is the original number?
Question 25 :
Lakshmi is a cashier in a bank. She has currency notes of denominations $₹ 100, ₹ 50 and ₹ 10$, respectively. The ratio of the number of these notes is 2:3:5. The total cash with Lakshmi is $₹$ 4,00,000. How many notes of $₹$ 50 does she have?
Question 28 :
A rational number is such that when you multiply it by $\frac{5}{2}$ and add $\frac{2}{3}$ to the product, you get $\frac{-7}{12}$. What is the number?
Question 30 :
The ages of Hari and Harry are in the ratio 5: 7. Four years from now, the ratio of their ages will be 3 :4. Find the present age of Hari.
Question 31 :
Find a repeater machine that will do the same work as a $(× \frac{1}{8})$ machine.
Question 32 :
Express the result in power notation with positive exponent.$(-4)^5 ÷ (-4)^8$
Question 38 :
By what number should $(–8)^{–3}$ be multiplied so that that the product may be equal to $(–6)^{–3}$?
Question 40 :
Express in standard form: Thickness of a thick paper is 0.07 mm