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 42 notes (of either $10 or €10,) then what is the total number of notes (of either $10 or €10,) they take? Choose the correct choice from the following answers
A) 70 B) 80 C) 100 D) 140 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 =42   or 3y =42 y =14 ;x =28 , total notes they carry = 4x+2y = 112+28= 
<gadget id="calculator">112+28</gadget>
<output>140</output>
140   140
<result>D</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 42 notes (of either $10 or €10,) then what is the total number of notes (of either $10 or €10,) they take?