Multiplication and Division of Integers — Maths STD 7 — Question

Mark against the correct answer in the following:If A : B = 2 : 3 and B : C = 4 : 5, then C : A = ?

1. 15 : 8
2. 6 : 5
3. 8 : 5
4. 8 : 15

Divide:
137.2 by 100

Fill in the blanks:
-(-83) = ………

The final marks in mathematics of 30 students are as follows:
53, 61, 48, 60, 78, 68, 55, 100, 67, 90
75, 88, 77, 37, 84, 58, 60, 48, 62, 56
44, 58, 52, 64, 98, 59, 70, 39, 50, 60
How many have scored 75 or more?

Identify the complementary and supplementary pairs of angle from the following pair:
120°, 60°

Find the Pythagorean triplets from among the following sets of numbers : 9,40,41

Identify the monomials, binomials, trinomials and quadrinomials from the following expressions:
xy + yz + zx

If 21 cows eat as much as 15 buffaloes, then how many cows will eat as much as 35 buffaloes?

1. 45
2. 49
3. 56
4. 54

Subtract:
-36 from 42