Question

if hcf of 90 & 45 is A &A =20-15y. find y

Answer 1

heya dear your answer is here.
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lcm of (90,45)= 90
so now
lcm ×hcf =a×b
90×A =90×45
90×(20-15y)=90×45
20-15y=45
15y=-25
y=-25/15 = -5/3