If an alloy contains copper and silver in the ratio 3:7, then the percentage quantity of silver in the alloy is:
(A) 90%
(B) 70%
(C) 60%
(D) None of these
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(A) 48
(B) 60
(C) 120
(D) None of these
…(A) 424 kg
(B) 575 kg
(C) 828 kg
(D) None of these
(A) 29.4
(B) 29.5
(C) 29.9
(D) None of these
(A) 3:5
(B) 2:5
(C) 5:3
(D) None of these
To factorize the expression y^2 + y – 6, we need to find two numbers whose product is -6 and whose sum is 1 (the coefficient of the middle term).
These numbers are 3 and -2, so we can write:
y^2 + y – 6 = (y + 3)(y – 2)
(A) 25
(B) 30
(C) 35
(D) None of these
(A) 57%
(B) 60%
(C) 76.4%
(D) None of these
…(A) Eva Lawler
(B) Jacinda Ardern
(C) Julia Gillard
(D) None of these