Mona and Donald fly to Rome for the weekend. They take cash only in notes of $10 and notes of €10. Mona carries three times the amount of euros Donald carries. She also carries as many dollars as Donald carries. The number of €10 notes they take is double the number of $10 notes they take. If Donald carries a total of 30 notes (of either $10 or €10,) then what is the total number of notes (of either $10 or €10,) they take? Answers
A) 70  B) 80  C) 100  D) 120  E) 150
let e10 =x no. d10 =y no. donald is having x+y notes mona carries 3x+y again x =2y or donald x+y =30   or 3y =30 y =10 ;x =20 , total notes they carry = 4x+2y = 80+20= 
<gadget id="calculator">80+20</gadget>
<output>100</output>
100   150
<result>E</result>
Mona and Donald fly to Rome for the weekend. They take cash only in notes of $10 and notes of €10. Mona carries three times the amount of euros Donald carries. She also carries as many dollars as Donald carries. The number of €10 notes they take is double the number of $10 notes they take. If Donald carries a total of 30 notes (of either $10 or €10,) then what is the total number of notes (of either $10 or €10,) they take?